France the French Republic, is a country whose territory consists of metropolitan France in Western Europe and several overseas regions and territories. The metropolitan area of France extends from the Mediterranean Sea to the English Channel and the North Sea, from the Rhine to the Atlantic Ocean, it is bordered by Belgium and Germany to the northeast and Italy to the east, Andorra and Spain to the south. The overseas territories include French Guiana in South America and several islands in the Atlantic and Indian oceans; the country's 18 integral regions span a combined area of 643,801 square kilometres and a total population of 67.3 million. France, a sovereign state, is a unitary semi-presidential republic with its capital in Paris, the country's largest city and main cultural and commercial centre. Other major urban areas include Lyon, Toulouse, Bordeaux and Nice. During the Iron Age, what is now metropolitan France was inhabited by a Celtic people. Rome annexed the area in 51 BC, holding it until the arrival of Germanic Franks in 476, who formed the Kingdom of Francia.
The Treaty of Verdun of 843 partitioned Francia into Middle Francia and West Francia. West Francia which became the Kingdom of France in 987 emerged as a major European power in the Late Middle Ages following its victory in the Hundred Years' War. During the Renaissance, French culture flourished and a global colonial empire was established, which by the 20th century would become the second largest in the world; the 16th century was dominated by religious civil wars between Protestants. France became Europe's dominant cultural and military power in the 17th century under Louis XIV. In the late 18th century, the French Revolution overthrew the absolute monarchy, established one of modern history's earliest republics, saw the drafting of the Declaration of the Rights of Man and of the Citizen, which expresses the nation's ideals to this day. In the 19th century, Napoleon established the First French Empire, his subsequent Napoleonic Wars shaped the course of continental Europe. Following the collapse of the Empire, France endured a tumultuous succession of governments culminating with the establishment of the French Third Republic in 1870.
France was a major participant in World War I, from which it emerged victorious, was one of the Allies in World War II, but came under occupation by the Axis powers in 1940. Following liberation in 1944, a Fourth Republic was established and dissolved in the course of the Algerian War; the Fifth Republic, led by Charles de Gaulle, remains today. Algeria and nearly all the other colonies became independent in the 1960s and retained close economic and military connections with France. France has long been a global centre of art and philosophy, it hosts the world's fourth-largest number of UNESCO World Heritage Sites and is the leading tourist destination, receiving around 83 million foreign visitors annually. France is a developed country with the world's sixth-largest economy by nominal GDP, tenth-largest by purchasing power parity. In terms of aggregate household wealth, it ranks fourth in the world. France performs well in international rankings of education, health care, life expectancy, human development.
France is considered a great power in global affairs, being one of the five permanent members of the United Nations Security Council with the power to veto and an official nuclear-weapon state. It is a leading member state of the European Union and the Eurozone, a member of the Group of 7, North Atlantic Treaty Organization, Organisation for Economic Co-operation and Development, the World Trade Organization, La Francophonie. Applied to the whole Frankish Empire, the name "France" comes from the Latin "Francia", or "country of the Franks". Modern France is still named today "Francia" in Italian and Spanish, "Frankreich" in German and "Frankrijk" in Dutch, all of which have more or less the same historical meaning. There are various theories as to the origin of the name Frank. Following the precedents of Edward Gibbon and Jacob Grimm, the name of the Franks has been linked with the word frank in English, it has been suggested that the meaning of "free" was adopted because, after the conquest of Gaul, only Franks were free of taxation.
Another theory is that it is derived from the Proto-Germanic word frankon, which translates as javelin or lance as the throwing axe of the Franks was known as a francisca. However, it has been determined that these weapons were named because of their use by the Franks, not the other way around; the oldest traces of human life in what is now France date from 1.8 million years ago. Over the ensuing millennia, Humans were confronted by a harsh and variable climate, marked by several glacial eras. Early hominids led a nomadic hunter-gatherer life. France has a large number of decorated caves from the upper Palaeolithic era, including one of the most famous and best preserved, Lascaux. At the end of the last glacial period, the climate became milder. After strong demographic and agricultural development between the 4th and 3rd millennia, metallurgy appeared at the end of the 3rd millennium working gold and bronze, iron. France has numerous megalithic sites from the Neolithic period, including the exceptiona
Brittany is a cultural region in the northwest of France, covering the western part of what was known as Armorica during the period of Roman occupation. It became an independent kingdom and a duchy before being united with the Kingdom of France in 1532 as a province governed as if it were a separate nation under the crown. Brittany has been referred to as Less, Lesser or Little Britain, it is bordered by the English Channel to the north, the Celtic Sea and the Atlantic Ocean to the west, the Bay of Biscay to the south. Its land area is 34,023 km². Brittany is the site of some of the world's oldest standing architecture, home to the Barnenez, the Tumulus Saint-Michel and others, which date to the early 5th millennium BC. Today, the historical province of Brittany is split among five French departments: Finistère in the west, Côtes-d'Armor in the north, Ille-et-Vilaine in the north east, Loire-Atlantique in the south east and Morbihan in the south on the Bay of Biscay. Since reorganisation in 1956, the modern administrative region of Brittany comprises only four of the five Breton departments, or 80% of historical Brittany.
The remaining area of old Brittany, the Loire-Atlantique department around Nantes, now forms part of the Pays de la Loire region. At the 2010 census, the population of historic Brittany was estimated to be 4,475,295. Of these, 71 % lived in the region of Brittany. In 2012, the largest metropolitan areas were Nantes and Brest. Brittany is the traditional homeland of the Breton people and is recognised by the Celtic League as one of the six Celtic nations, retaining a distinct cultural identity that reflects its history. A nationalist movement seeks greater autonomy within the French Republic; the word Brittany, along with its French and Gallo equivalents Bretagne and Bertaèyn, derive from the Latin Britannia, which means "Britons' land". This word had been used by the Romans since the 1st century to refer to Great Britain, more the Roman province of Britain; this word derives from a Greek word, Πρεττανικη or Βρεττανίαι, used by Pytheas, an explorer from Massalia who visited the British Islands around 320 BC.
The Greek word itself comes from the common Brythonic ethnonym reconstructed as *Pritanī, itself from Proto-Celtic *kʷritanoi. The Romans called Brittany Armorica, together with a quite indefinite region that extended along the English Channel coast from the Seine estuary to the Loire estuary, according to several sources, maybe along the Atlantic coast to the Garonne estuary; this term comes from a Gallic word, which means "close to the sea". Another name, was used until the 12th century, it means "wide and flat" or "to expand" and it gave the Welsh name for Brittany: Llydaw. After the fall of the Western Roman Empire, many Britons settled in western Armorica, the region started to be called Britannia, although this name only replaced Armorica in the sixth century or by the end of the fifth. Authors like Geoffrey of Monmouth used the terms Britannia minor and Britannia major to distinguish Brittany from Britain. Breton-speaking people may pronounce the word Breizh in two different ways, according to their region of origin.
Breton can be divided into the dialect of Vannes. KLT speakers pronounce it and would write it Breiz, while the Vannetais speakers pronounce it and would write it Breih; the official spelling is a compromise with a z and an h together. In 1941, efforts to unify the dialects led to the creation of the so-called Breton zh, a standard which has never been accepted. On its side, Gallo language has never had a accepted writing system and several ones coexist. For instance, the name of the region in that language can be written Bertaèyn in ELG script, or Bertègn in MOGA, a couple of other scripts exist. Brittany has been inhabited by humans since the Lower Paleolithic; the first settlers were Neanderthals. This population was scarce and similar to the other Neanderthals found in the whole of Western Europe, their only original feature was a distinct culture, called "Colombanian". One of the oldest hearths in the world has been found in Finistère, it is 450,000 years old. Homo sapiens settled in Brittany around 35,000 years ago.
They replaced or absorbed the Neanderthals and developed local industries, similar to the Châtelperronian or to the Magdalenian. After the last glacial period, the warmer climate allowed the area to become wooded. At that time, Brittany was populated by large communities who started to change their lifestyles from a life of hunting and gathering, to become settled farmers. Agriculture was introduced during the 5th millennium BC by migrants from the east. However, the Neolithic Revolution in Brittany did not happen due to a radical change of population, but by slow immigration and exchange of skills. Neolithic Brittany is characterised by important megalithic production, it is sometimes designated as the "core area" of megalithic culture; the oldest monuments, were followed by princely tombs and stone rows. The Morbihan département, on the southern coast, comprises a large share of these structures, including the Carnac stones and the Broken Menhir of Er Grah in the Locmariaquer megaliths, the largest single stone erected by Neoli
The Black Forest is a large forested mountain range in the state of Baden-Württemberg in southwest Germany. It is bounded by the Rhine valley to the south, its highest peak is the Feldberg with an elevation of 1,493 metres. The region is oblong in shape with a length of 160 km and breadth of up to 50 km; the Black Forest stretches from the High Rhine in the south to the Kraichgau in the north. In the west it is bounded by the Upper Rhine Plain; the Black Forest is the highest part of the South German Scarplands and much of it is densely wooded, a fragment of the Hercynian Forest of Antiquity. It lies upon rocks of the crystalline basement and Bunter Sandstone, its natural boundary with the surrounding landscapes is formed by the emergence of muschelkalk, absent from the Black Forest bedrock. Thanks to the fertility of the soil, dependent on the underlying rock, this line is both a vegetation boundary as well as the border between the Altsiedelland and the Black Forest, not permanently settled until the High Middle Ages.
From north to south the Black Forest extends for over 160 km, attaining a width of up to 50 kilometres in the south, up to 30 kilometres in the north. Tectonically the range forms a lifted fault block, which rises prominently in the west from the Upper Rhine Plain, whilst seen from the east it has the appearance of a forested plateau; the natural regions of the Black Forest are separated by various features: Geomorphologically, the main division is between the gentle eastern slopes with their rounded hills and broad plateaux and the incised, steeply falling terrain in the west that drops into the Upper Rhine Graben. It is here, in the west, where the highest mountains and the greatest local differences in height are found; the valleys are narrow and ravine-like. The summits are rounded and there are the remnants of plateaux and arête-like landforms. Geologically the clearest division is between east and west. Large areas of the eastern Black Forest, the lowest layer of the South German Scarplands composed of Bunter Sandstone, are covered by endless coniferous forest with their island clearings.
The exposed basement in the west, predominantly made up of metamorphic rocks and granites, despite its rugged topography, easier to settle and appears much more open and inviting today with its varied meadow valleys. The most common way of dividing the regions of the Black Forest is, from north to south; until the 1930s, the Black Forest was divided into the Northern and Southern Black Forest, the boundary being the line of the Kinzig valley. The Black Forest was divided into the forested Northern Black Forest, the lower, central section, predominantly used for agriculture in the valleys, was the Central Black Forest and the much higher Southern Black Forest with its distinctive highland economy and ice age glacial relief; the term High Black Forest referred to the highest areas of the South and southern Central Black Forest. The boundaries drawn were, quite varied. In 1931, Robert Gradmann called the Central Black Forest the catchment area of the Kinzig and in the west the section up to the lower Elz and Kinzig tributary of the Gutach.
A pragmatic division, oriented not just on natural and cultural regions, uses the most important transverse valleys. Based on that, the Central Black Forest is bounded by the Kinzig in the north and the line from Dreisam to Gutach in the south, corresponding to the Bonndorf Graben zone and the course of the present day B 31. In 1959, Rudolf Metz combined the earlier divisions and proposed a modified tripartite division himself, which combined natural and cultural regional approaches and was used, his Central Black Forest is bounded in the north by the watershed between the Acher and Rench and subsequently between the Murg and Kinzig or Forbach and Kinzig, in the south by the Bonndorf Graben zone, which restricts the Black Forest in the east as does the Freudenstadt Graben further north by its transition into the Northern Black Forest. The Handbook of the Natural Region Divisions of Germany published by the Federal Office of Regional Geography since the early 1950s names the Black Forest as one of six tertiary level major landscape regions within the secondary level region of the South German Scarplands and, at the same time, one of nine new major landscape unit groups.
It is divided into six so-called major units. This division was refined and modified in several, successor publications up to 1967, each covering individual sections of the map; the mountain range was divided into three regions. The northern boundary of the Central Black Forest in this classification runs south of the Rench Valley and the Kniebis to near Freudenstadt, its southern boundary varied with each edition. In 1998 the Baden-Württemberg State Department for Environmental Protection published a reworked Natural Region Division of Baden-Württemberg, it is restricted to the level of the natural regional major units and has been used since for the state's administration of nature conservation: The Black Forest Foothills (Schwarzwald-Rand
The Seine is a 777-kilometre-long river and an important commercial waterway within the Paris Basin in the north of France. It rises at Source-Seine, 30 kilometres northwest of Dijon in northeastern France in the Langres plateau, flowing through Paris and into the English Channel at Le Havre, it is navigable by ocean-going vessels as far as Rouen, 120 kilometres from the sea. Over 60 percent of its length, as far as Burgundy, is negotiable by commercial riverboats, nearly its whole length is available for recreational boating. There are 37 bridges within dozens more spanning the river outside the city. Examples in Paris include the Pont Alexandre III and Pont Neuf, the latter of which dates back to 1607. Outside the city, examples include the Pont de Normandie, one of the longest cable-stayed bridges in the world, which links Le Havre to Honfleur; the Seine rises in the commune of Source-Seine, about 30 kilometres northwest of Dijon. The source has been owned by the city of Paris since 1864. A number of associated small ditches or depressions provide the source waters, with an artificial grotto laid out to highlight and contain a deemed main source.
The grotto includes a statue of a nymph, a dog, a dragon. On the same site are the buried remains of a Gallo-Roman temple. Small statues of the dea Sequana "Seine goddess" and other ex voti found at the same place are now exhibited in the Dijon archaeological museum; the Seine can artificially be divided into five parts: the Petite Seine "Small Seine" from the sources to Montereau-Fault-Yonne the Haute Seine "Upper Seine" from Montereau-Fault-Yonne to Paris the Traversée de Paris "the Paris waterway" the Basse Seine "Lower Seine" from Paris to Rouen the Seine maritime "Maritime Seine" from Rouen to the English channel. The Seine is dredged and ocean-going vessels can dock at Rouen, 120 kilometres from the sea. Commercial craft can use the river from 516 kilometres to its mouth. At Paris, there are 37 bridges; the river is only 24 metres above sea level 446 kilometres from its mouth, making it slow flowing and thus navigable. The Seine Maritime, 123 kilometres from the English Channel at Le Havre to Rouen, is the only portion of the Seine used by ocean-going craft.
The tidal section of the Seine Maritime is followed by a canalized section with four large multiple locks until the mouth of the Oise at Conflans-Sainte-Honorine. Smaller locks at Bougival and at Suresnes lift the vessels to the level of the river in Paris, where the junction with the Canal Saint-Martin is located; the distance from the mouth of the Oise is 72 km. The Haute Seine, from Paris to Montereau-Fault-Yonne, has 8 locks. At Charenton-le-Pont is the mouth of the Marne. Upstream from Paris seven locks ensure navigation to Saint Mammès, where the Loing mouth is situated. Through an eighth lock the river Yonne is reached at Montereau-Fault-Yonne. From the mouth of the Yonne, larger ships can continue upstream to Nogent-sur-Seine. From there on, the river is navigable only by small craft to Marcilly-sur-Seine. At Marcilly-sur-Seine the ancient Canal de la Haute-Seine used to allow vessels to continue all the way to Troyes; this canal has been abandoned since 1957. The average depth of the Seine today at Paris is about 9.5 metres.
Until locks were installed to raise the level in the 1800s, the river was much shallower within the city most of the time, consisted of a small channel of continuous flow bordered by sandy banks. Today the depth is controlled and the entire width of the river between the built-up banks on either side is filled with water; the average flow of the river is low, only a few cubic metres per second, but much higher flows are possible during periods of heavy runoff. Special reservoirs upstream help to maintain a constant level for the river through the city, but during periods of extreme runoff significant increases in river level may occur. A severe period of high water in January 1910 resulted in extensive flooding throughout the city; the Seine again rose to threatening levels in 1924, 1955, 1982, 1999–2000, June 2016, January 2018. After a first-level flood alert in 2003, about 100,000 works of art were moved out of Paris, the largest relocation of art since World War II. Much of the art in Paris is kept in underground storage rooms.
A 2002 report by the French government stated the worst-case Seine flood scenario would cost 10 billion euros and cut telephone service for a million Parisians, leaving 200,000 without electricity and 100,000 without gas. In January 2018 the Seine again flooded. An official warning was issued on January 24 that heavy rainfall was to cause the river to flood. By January 27, the river was rising; the Deputy Mayor of Paris, Colombe Brossel, warned that the heavy rain was caused by climate change, that "We have to understand that climatic change is not a word, it's a reality." The basin area is 78,910 square kilometres, 2 percent of, forest and 78 percent cultivated land. In addition to Paris, three other cities with a population over 100,000 are in the Seine watershed: Le Havre at the estuary, Rouen in the Seine valley and Reims at the northern limit—with an annual urban growth rate of 0.2 percent. The population density is 201 per square kilometer. Periodically
The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era. The Ordovician spans 41.2 million years from the end of the Cambrian Period 485.4 million years ago to the start of the Silurian Period 443.8 Mya. The Ordovician, named after the Celtic tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in northern Wales into the Cambrian and Silurian systems, respectively. Lapworth recognized that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian systems, placed them in a system of their own; the Ordovician received international approval in 1960, when it was adopted as an official period of the Paleozoic Era by the International Geological Congress. Life continued to flourish during the Ordovician as it did in the earlier Cambrian period, although the end of the period was marked by the Ordovician–Silurian extinction events.
Invertebrates, namely molluscs and arthropods, dominated the oceans. The Great Ordovician Biodiversification Event increased the diversity of life. Fish, the world's first true vertebrates, continued to evolve, those with jaws may have first appeared late in the period. Life had yet to diversify on land. About 100 times as many meteorites struck the Earth per year during the Ordovician compared with today; the Ordovician Period began with a major extinction called the Cambrian–Ordovician extinction event, about 485.4 Mya. It lasted for about 42 million years and ended with the Ordovician–Silurian extinction events, about 443.8 Mya which wiped out 60% of marine genera. The dates given are recent radiometric dates and vary from those found in other sources; this second period of the Paleozoic era created abundant fossils that became major petroleum and gas reservoirs. The boundary chosen for the beginning of both the Ordovician Period and the Tremadocian stage is significant, it correlates well with the occurrence of widespread graptolite and trilobite species.
The base of the Tremadocian allows scientists to relate these species not only to each other, but to species that occur with them in other areas. This makes it easier to place many more species in time relative to the beginning of the Ordovician Period. A number of regional terms have been used to subdivide the Ordovician Period. In 2008, the ICS erected a formal international system of subdivisions. There exist Baltoscandic, Siberian, North American, Chinese Mediterranean and North-Gondwanan regional stratigraphic schemes; the Ordovician Period in Britain was traditionally broken into Early and Late epochs. The corresponding rocks of the Ordovician System are referred to as coming from the Lower, Middle, or Upper part of the column; the faunal stages from youngest to oldest are: Late Ordovician Hirnantian/Gamach Rawtheyan/Richmond Cautleyan/Richmond Pusgillian/Maysville/Richmond Middle Ordovician Trenton Onnian/Maysville/Eden Actonian/Eden Marshbrookian/Sherman Longvillian/Sherman Soudleyan/Kirkfield Harnagian/Rockland Costonian/Black River Chazy Llandeilo Whiterock Llanvirn Early Ordovician Cassinian Arenig/Jefferson/Castleman Tremadoc/Deming/Gaconadian The Tremadoc corresponds to the Tremadocian.
The Floian corresponds to the lower Arenig. The Llanvirn occupies the rest of the Darriwilian, terminates with it at the base of the Late Ordovician; the Sandbian represents the first half of the Caradoc. During the Ordovician, the southern continents were collected into Gondwana. Gondwana started the period in equatorial latitudes and, as the period progressed, drifted toward the South Pole. Early in the Ordovician, the continents of Laurentia and Baltica were still independent continents, but Baltica began to move towards Laurentia in the period, causing the Iapetus Ocean between them to shrink; the small continent Avalonia separated from Gondwana and began to move north towards Baltica and Laurentia, opening the Rheic Ocean between Gondwana and Avalonia. The Taconic orogeny, a major mountain-building episode, was well under way in Cambrian times. In the early and middle Ordovician, temperatures were mild, but at the beginning of the Late Ordovician, from 460 to 450 Ma, volcanoes along the margin of the Iapetus Ocean spewed massive amounts of carbon dioxide, a greenhouse gas, into the atmosphere, turning the planet into a hothouse.
Sea levels were high, but as Gondwana moved south, ice accumulated into glaciers and sea levels dropped. At first, low-lying sea beds increased diversity, but glaciation led to mass extinctions as the seas drained and continental shelves became dry land. During the Ordovician, in fact during the Tremadocian, marine transgressions worldwide were the greatest for which evidence is preserved; these volcanic island arcs collided with proto North America to form the Appalachian mountains. By the end of the Late Ordovician the volcanic emissions had stopped. Gondwana had by that time neared the South Pole and was glaciated
The Gauls were a group of Celtic peoples of West-Central Europe in the Iron Age and the Roman period. The area they inhabited was known as Gaul, their Gaulish language forms the main branch of the Continental Celtic languages. The Gauls emerged around the 5th century BC as the bearers of the La Tène culture north of the Alps. By the 4th century BC, they spread over much of what is now France, Spain, Switzerland, Southern Germany, the Czech Republic and Slovakia by virtue of controlling the trade routes along the river systems of the Rhône, Seine and Danube, they expanded into Northern Italy, the Balkans and Galatia. Gaul was never united under a single ruler or government, but the Gallic tribes were capable of uniting their forces in large-scale military operations, they reached the peak of their power in the early 3rd century BC. The rising Roman Republic after the end of the First Punic War put pressure on the Gallic sphere of influence. After this, Gaul became a province of the Roman Empire, the Gauls culturally adapted to the Roman world, bringing about the formation of the hybrid Gallo-Roman culture.
The Gauls of Gallia Celtica according to the testimony of Caesar called themselves Celtae in their own language, Galli in Latin. As is not unusual with ancient ethnonyms, these names came to be applied more than their original sense, Celtae being the origin of the term Celts itself while Galli is the origin of the adjective Gallic, now referring to all of Gaul; the name Gaul itself is not from the Germanic word * Walhaz. Gaulish culture developed out of the Celtic cultures over the first millennia BC; the Urnfield culture represents the Celts as a distinct cultural branch of the Indo-European-speaking people. The spread of iron working led to the Hallstatt culture in the 8th century BC; the Hallstatt culture evolved into the La Tène culture in around the 5th century BC. The Greek and Etruscan civilizations and colonies began to influence the Gauls in the Mediterranean area. Gauls under Brennus invaded Rome circa 390 BC. By the 5th century BC, the tribes called Gauls had migrated from Central France to the Mediterranean coast.
Gallic invaders settled the Po Valley in the 4th century BC, defeated Roman forces in a battle under Brennus in 390 BC and raided Italy as far as Sicily. In the 3rd century BC, the Gauls attempted an eastward expansion in 281-279 BC, towards the Balkan peninsula, which at that time was a Greek province, with the ultimate goal to reach and loot the rich Greek city-states of the Greek mainland, but the majority of the Gaul army was exterminated by the Greeks and the few Gauls that survived were forced to flee. A large number of Gauls served in the armies of Carthage during the Punic Wars, one of the leading rebel leaders of the Mercenary War, was of Gallic origin. During the Balkan expedition, led by Cerethrios and Bolgios, the Gauls raided twice the Greek mainland. At the end of the second expedition the Gallic raiders had been repelled by the coalition armies of the various Greek city-states and were forced to retreat to Illyria and Thrace, but the Greeks were forced to grant safe-passage to the Gauls who made their way to Asia Minor and settled in Central Anatolia.
The Gallic area of settlement in Asia Minor was called Galatia. But they were checked through the use of war elephants and skirmishers by the Greek Seleucid king Antiochus I in 275 BC, after which they served as mercenaries across the whole Hellenistic Eastern Mediterranean, including Ptolemaic Egypt, where they, under Ptolemy II Philadelphus, attempted to seize control of the kingdom. In the first Gallic invasion of Greece, they achieved victory over the Macedonians and killed the Macedonian king Ptolemy Keraunos, they focused on looting the rich Macedonian countryside, but avoided the fortified cities. The Macedonian general Sosthenes assembled an army, defeated Bolgius and repelled the invading Gauls. In the second Gaulish invasion of Greece, the Gauls, led by Brennos, suffered heavy losses while facing the Greek coalition army at Thermopylae, but helped by the Heracleans they followed the mountain path around Thermopylae to encircle the Greek army in the same way that the Persian army had done at the Battle of Thermopylae in 480 BC, but this time deafeating the whole of the Greek army.
After passing Thermopylae the Gauls headed for the rich treasury at Delphi, where they were defeated by the re-assembled Greek army. This led to a series of retreats of the Gauls, with devastating losses, all the way up to Macedonia and out of the Greek mainland; the major part of the Gaul army was defeated in the process, those Gauls survived were forced to flee from Greece. The Gallic leader Brennos was injured at Delphi and committed suicide there. (He is not to be confused with another Gaulish leader bearing the same name who had sacked Rome a century earlier. In 278 BC Gaulish settlers in the Balkans were invited by Nicomedes I of Bithynia to help him in a dynastic struggle against his brother, they numbered about 10,000 fighting men and about the same number of
The Paleozoic Era is the earliest of three geologic eras of the Phanerozoic Eon. It is the longest of the Phanerozoic eras, lasting from 541 to 251.902 million years ago, is subdivided into six geologic periods: the Cambrian, Silurian, Devonian and Permian. The Paleozoic comes after the Neoproterozoic Era of the Proterozoic Eon and is followed by the Mesozoic Era; the Paleozoic was a time of dramatic geological and evolutionary change. The Cambrian witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Arthropods, fish, amphibians and diapsids all evolved during the Paleozoic. Life began in the ocean but transitioned onto land, by the late Paleozoic, it was dominated by various forms of organisms. Great forests of primitive plants covered the continents, many of which formed the coal beds of Europe and eastern North America. Towards the end of the era, sophisticated diapsids and synapsids were dominant and the first modern plants appeared.
The Paleozoic Era ended with the largest extinction event in the history of Earth, the Permian–Triassic extinction event. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic Era to recover. Recovery of life in the sea may have been much faster; the Paleozoic era began and ended with supercontinents and in between were the rise of mountains along the continental margins, flooding and draining of shallow seas between the mountain ranges, in the interior of the continents. At its start, the supercontinent Pannotia broke up. Paleoclimatic studies and evidence of glaciers indicate that central Africa was most in the polar regions during the early Paleozoic. During the early Paleozoic, the huge continent Gondwana was forming. By mid-Paleozoic, the collision of North America and Europe produced the Acadian-Caledonian uplifts, a subduction plate uplifted eastern Australia. By the late Paleozoic, continental collisions formed the supercontinent of Pangaea and resulted in some of the great mountain chains, including the Appalachians, Ural Mountains, mountains of Tasmania.
There are six periods in the Paleozoic Era: Cambrian, Silurian, Devonian and the Permian. The Cambrian spans from 541 million years to 485 million years and is the first period of the Paleozoic era of the Phanerozoic; the Cambrian marked a boom in evolution in an event known as the Cambrian explosion in which the largest number of creatures evolved in any single period of the history of the Earth. Creatures like algae evolved, but the most ubiquitous of that period were the armored arthropods, like trilobites. All marine phyla evolved in this period. During this time, the supercontinent Pannotia begins to break up, most of which became the supercontinent Gondwana; the Ordovician spanned from 485 million years to 443 million years ago. The Ordovician was a time in Earth's history in which many of the biological classes still prevalent today evolved, such as primitive fish and coral; the most common forms of life, were trilobites and shellfish. More the first arthropods went ashore to colonize the empty continent of Gondwana.
By the end of the Ordovician, Gondwana was at the south pole, early North America had collided with Europe, closing the Atlantic Ocean. Glaciation of Africa resulted in a major drop in sea level, killing off all life that had established along coastal Gondwana. Glaciation may have caused the Ordovician–Silurian extinction events, in which 60% of marine invertebrates and 25% of families became extinct, is considered the first mass extinction event and the second deadliest; the Silurian spanned from 443 to 416 million years ago. The Silurian saw the rejuvenation of life; this period saw the mass evolution of fish, as jawless fish became more numerous, jawed fish evolved, the first freshwater fish evolved, though arthropods, such as sea scorpions, were still apex predators. Terrestrial life evolved, including early arachnids and centipedes; the evolution of vascular plants allowed plants to gain a foothold on land. These early plants were the forerunners of all plant life on land. During this time, there were four continents: Gondwana, Laurentia and Avalonia.
The recent rise in sea levels allowed many new species to thrive in water. The Devonian spanned from 416 million years to 359 million years ago. Known as "The Age of the Fish", the Devonian featured a huge diversification of fish, including armored fish like Dunkleosteus and lobe-finned fish which evolved into the first tetrapods. On land, plant groups diversified in an event known as the Devonian Explosion when plants made lignin allowing taller growth and vascular tissue: the first trees evolved, as well as seeds; this event diversified arthropod life, by providing them new habitats. The first amphibians evolved, the fish were now at the top of the food chain. Near the end of the Devonian, 70% of all species became extinct in an event known as the Late Devonian extinction, the Earth's second mass extinction event; the Carboniferous spanned from 359 million to 299 million years ago. During this time, average global temperatures were exc