1.
Byzantine Empire
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It survived the fragmentation and fall of the Western Roman Empire in the 5th century AD and continued to exist for an additional thousand years until it fell to the Ottoman Turks in 1453. During most of its existence, the empire was the most powerful economic, cultural, several signal events from the 4th to 6th centuries mark the period of transition during which the Roman Empires Greek East and Latin West divided. Constantine I reorganised the empire, made Constantinople the new capital, under Theodosius I, Christianity became the Empires official state religion and other religious practices were proscribed. Finally, under the reign of Heraclius, the Empires military, the borders of the Empire evolved significantly over its existence, as it went through several cycles of decline and recovery. During the reign of Maurice, the Empires eastern frontier was expanded, in a matter of years the Empire lost its richest provinces, Egypt and Syria, to the Arabs. This battle opened the way for the Turks to settle in Anatolia, the Empire recovered again during the Komnenian restoration, such that by the 12th century Constantinople was the largest and wealthiest European city. Despite the eventual recovery of Constantinople in 1261, the Byzantine Empire remained only one of several small states in the area for the final two centuries of its existence. Its remaining territories were annexed by the Ottomans over the 15th century. The Fall of Constantinople to the Ottoman Empire in 1453 finally ended the Byzantine Empire, the term comes from Byzantium, the name of the city of Constantinople before it became Constantines capital. This older name of the city would rarely be used from this point onward except in historical or poetic contexts. The publication in 1648 of the Byzantine du Louvre, and in 1680 of Du Canges Historia Byzantina further popularised the use of Byzantine among French authors, however, it was not until the mid-19th century that the term came into general use in the Western world. The Byzantine Empire was known to its inhabitants as the Roman Empire, the Empire of the Romans, Romania, the Roman Republic, Graikia, and also as Rhōmais. The inhabitants called themselves Romaioi and Graikoi, and even as late as the 19th century Greeks typically referred to modern Greek as Romaika and Graikika. The authority of the Byzantine emperor as the legitimate Roman emperor was challenged by the coronation of Charlemagne as Imperator Augustus by Pope Leo III in the year 800. No such distinction existed in the Islamic and Slavic worlds, where the Empire was more seen as the continuation of the Roman Empire. In the Islamic world, the Roman Empire was known primarily as Rûm, the Roman army succeeded in conquering many territories covering the entire Mediterranean region and coastal regions in southwestern Europe and north Africa. These territories were home to different cultural groups, both urban populations and rural populations. The West also suffered heavily from the instability of the 3rd century AD
2.
Copper
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Copper is a chemical element with symbol Cu and atomic number 29. It is a soft, malleable, and ductile metal with high thermal and electrical conductivity. A freshly exposed surface of copper has a reddish-orange color. Copper is one of the few metals that occur in nature in directly usable metallic form as opposed to needing extraction from an ore and this led to very early human use, from c.8000 BC. Copper used in buildings, usually for roofing, oxidizes to form a green verdigris, Copper is sometimes used in decorative art, both in its elemental metal form and in compounds as pigments. Copper compounds are used as agents, fungicides, and wood preservatives. Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the enzyme complex cytochrome c oxidase. In molluscs and crustaceans, copper is a constituent of the blood pigment hemocyanin, replaced by the hemoglobin in fish. In humans, copper is found mainly in the liver, muscle, the adult body contains between 1.4 and 2.1 mg of copper per kilogram of body weight. The filled d-shells in these elements contribute little to interatomic interactions, unlike metals with incomplete d-shells, metallic bonds in copper are lacking a covalent character and are relatively weak. This observation explains the low hardness and high ductility of single crystals of copper, at the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is supplied in a fine-grained polycrystalline form. The softness of copper partly explains its high conductivity and high thermal conductivity. The maximum permissible current density of copper in open air is approximately 3. 1×106 A/m2 of cross-sectional area, Copper is one of a few metallic elements with a natural color other than gray or silver. Pure copper is orange-red and acquires a reddish tarnish when exposed to air, as with other metals, if copper is put in contact with another metal, galvanic corrosion will occur. A green layer of verdigris can often be seen on old structures, such as the roofing of many older buildings. Copper tarnishes when exposed to sulfur compounds, with which it reacts to form various copper sulfides. There are 29 isotopes of copper, 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper, both have a spin of 3⁄2
3.
Constantine the Great
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Constantine the Great, also known as Constantine I or Saint Constantine, was a Roman Emperor from 306 to 337 AD. Constantine was the son of Flavius Valerius Constantius, a Roman Army officer and his father became Caesar, the deputy emperor in the west, in 293 AD. Constantine was sent east, where he rose through the ranks to become a military tribune under the emperors Diocletian, in 305, Constantius was raised to the rank of Augustus, senior western emperor, and Constantine was recalled west to campaign under his father in Britannia. As emperor, Constantine enacted many administrative, financial, social, the government was restructured and civil and military authority separated. A new gold coin, the solidus, was introduced to combat inflation and it would become the standard for Byzantine and European currencies for more than a thousand years. He called the First Council of Nicaea in 325, at which the Nicene Creed was adopted by Christians, in military matters, the Roman army was reorganised to consist of mobile field units and garrison soldiers capable of countering internal threats and barbarian invasions. The age of Constantine marked an epoch in the history of the Roman Empire. He built a new residence at Byzantium and renamed the city Constantinople after himself. It would later become the capital of the Empire for over one thousand years and his more immediate political legacy was that, in leaving the empire to his sons, he replaced Diocletians tetrarchy with the principle of dynastic succession. His reputation flourished during the lifetime of his children and centuries after his reign, the medieval church upheld him as a paragon of virtue while secular rulers invoked him as a prototype, a point of reference, and the symbol of imperial legitimacy and identity. Beginning with the Renaissance, there were more critical appraisals of his due to the rediscovery of anti-Constantinian sources. Critics portrayed him as a tyrant, trends in modern and recent scholarship attempted to balance the extremes of previous scholarship. The Church of the Holy Sepulchre, built on his orders at the site of Jesus tomb in Jerusalem. The Papal claim to power in the High Middle Ages was based on the supposed Donation of Constantine. He is venerated as a saint by Eastern Orthodox and Byzantine Catholics, though Constantine has historically often been referred to as the First Christian Emperor, scholars debate his actual beliefs or even his actual comprehension of the Christian faith itself. Constantine was a ruler of major importance, and he has always been a controversial figure, the fluctuations in Constantines reputation reflect the nature of the ancient sources for his reign. These are abundant and detailed, but have strongly influenced by the official propaganda of the period. There are no surviving histories or biographies dealing with Constantines life, the nearest replacement is Eusebius of Caesareas Vita Constantini, a work that is a mixture of eulogy and hagiography
4.
Gold
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Gold is a chemical element with symbol Au and atomic number 79. In its purest form, it is a bright, slightly yellow, dense, soft, malleable. Chemically, gold is a metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions, Gold often occurs in free elemental form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the element silver and also naturally alloyed with copper. Less commonly, it occurs in minerals as gold compounds, often with tellurium, golds atomic number of 79 makes it one of the higher numbered, naturally occurring elements. It is thought to have produced in supernova nucleosynthesis, from the collision of neutron stars. Because the Earth was molten when it was formed, almost all of the present in the early Earth probably sank into the planetary core. Gold is resistant to most acids, though it does dissolve in aqua regia, a mixture of acid and hydrochloric acid. Gold also dissolves in solutions of cyanide, which are used in mining and electroplating. Gold dissolves in mercury, forming amalgam alloys, but this is not a chemical reaction, as a precious metal, gold has been used for coinage, jewelry, and other arts throughout recorded history. A total of 186,700 tonnes of gold is in existence above ground, the world consumption of new gold produced is about 50% in jewelry, 40% in investments, and 10% in industry. Gold is also used in infrared shielding, colored-glass production, gold leafing, certain gold salts are still used as anti-inflammatories in medicine. As of 2014, the worlds largest gold producer by far was China with 450 tonnes, Gold is cognate with similar words in many Germanic languages, deriving via Proto-Germanic *gulþą from Proto-Indo-European *ǵʰelh₃-. The symbol Au is from the Latin, aurum, the Latin word for gold, the Proto-Indo-European ancestor of aurum was *h₂é-h₂us-o-, meaning glow. This word is derived from the root as *h₂éu̯sōs, the ancestor of the Latin word Aurora. This etymological relationship is presumably behind the frequent claim in scientific publications that aurum meant shining dawn, Gold is the most malleable of all metals, a single gram can be beaten into a sheet of 1 square meter, and an avoirdupois ounce into 300 square feet. Gold leaf can be thin enough to become semi-transparent
5.
Basil II
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Basil II was a Byzantine Emperor from the Macedonian dynasty who reigned from 10 January 976 to 15 December 1025. He was known in his time as Basil the Porphyrogenitus and Basil the Young to distinguish him from his supposed ancestor, the early years of his long reign were dominated by civil war against powerful generals from the Anatolian aristocracy. For this he was nicknamed the Bulgar Slayer, by which he is popularly known and his reign is therefore often seen as the medieval apogee of the Empire. She originated from the Peloponnese, possibly from the city of Sparta, Basils paternal ancestry is of uncertain origins, his putative ancestor Basil I, the founder of the dynasty, being variously ascribed Armenian, Slavic, or Greek origins. Indeed the biological father of Leo VI the Wise was possibly not Basil I, the family of Michael III were Anatolian Greeks from Phrygia, though originally of the Melchisedechian heretical faith. In 960, Basil was associated on the throne by his father, who died in 963. Nikephoros was murdered in 969 by his nephew John I Tzimisces, when Tzimisces died on 10 January 976, Basil II finally took the throne as senior emperor. Basil was a soldier and a superb horseman, and he would prove himself as an able general. Basil waited and watched without interfering, devoting himself to learning the details of administrative business, even though Nikephoros II Phokas and John I Tzimiskes were brilliant military commanders, both had proven to be lax administrators. Skleros was allowed to live, but he ended his days blind, perhaps through disease and these rebellions had a profound effect on Basils outlook and methods of governance. The historian Psellus describes the defeated Bardas Skleros giving Basil the following advice, let no generals on campaign have too many resources. Exhaust them with unjust exactions, to keep them busied with their own affairs, admit no woman to the imperial councils. Share with few your most intimate plans, Basil, it would appear, took this advice to heart. In order to defeat these dangerous revolts, Basil formed an alliance with Prince Vladimir I of Kiev, who in 988 had captured Chersonesos, Vladimir offered to evacuate Chersonesos and to supply 6,000 of his soldiers as reinforcements to Basil. In exchange he demanded to be married to Basils younger sister Anna, the Byzantines viewed all the nations of Northern Europe, be they Franks or Slavs, as barbarians. Anna herself objected to marrying a barbarian ruler, as such a marriage would have no precedence in imperial annals, Vladimir had conducted long-running research into different religions, including sending delegates to various countries. Marriage was not his primary reason for choosing the Orthodox religion, when Vladimir promised to baptize himself and to convert his people to Christianity, Basil finally agreed. Vladimir and Anna were married in the Crimea in 989, the Rus recruitments were instrumental in ending the rebellion, and they were later organized into the Varangian Guard
6.
Michael IV the Paphlagonian
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Michael IV the Paphlagonian was Byzantine Emperor from 11 April 1034 to his death on 10 December 1041. He owed his elevation to Empress Zoe, daughter of Emperor Constantine VIII, Michael came from a family of Paphlagonian peasants, one of whom, the parakoimomenos John the Orphanotrophos, had come to preside over the womans quarters at the imperial palace. John brought his brothers into the court and there the empress Zoe became enamoured of the youngest, Michael. Prior to his appointment, Michael was originally a money-changer. Zoe flaunted Michael openly, and spoke about making him emperor, hearing the rumours, Romanos was concerned and confronted Michael, but he denied the accusations, swearing his innocence on some holy relics. Then, on April 11,1034, Zoe’s husband, Romanos III was found dead in his bath, rumours soon began circulating that Zoe and Michael had decided to use a slow poison to kill him. However, becoming impatient with the poison Michael had had him strangled or drowned, adding weight to the rumours was the speed with which Zoe and Michael were married, on the very day that Romanos III died. The next day, April 12,1034, the couple summoned the Patriarch Alexios I to officiate in the coronation of the new emperor, although he initially refused to co-operate, the payment of 50 pounds of gold helped change his mind. He proceeded to crown Michael IV as the new emperor of the Romans, Michael IV was handsome, clever, and generous, but he was uneducated and suffered from epileptic fits. Michael IV was concerned about Zoe turning on him the way she had turned on Romanos, Zoe was confined to the palace gynaeceum, and kept under strict surveillance, while Michael’s visits grew more and more infrequent. Johns reforms of the army and financial system revived for a while the strength of the Empire, but the increase in taxation caused discontent among both nobles and commoners. Johns monopoly of the government, and his policies, such as the introduction of the Aerikon tax, led to several failed conspiracies against him, there were local revolts at Antioch, Nicopolis and Bulgaria. In 1034, Constantine Dalassenos was arrested by Michael on suspicion of treason, in 1037, Zoe was involved in a conspiracy to have John the Eunuch poisoned. In 1038, there was an uprising in the armies in Anatolia, in 1040, there was a conspiracy involving the patrician Michael Keroularios, who became a monk to save his life and was later elected as Patriarch of Constantinople. Finally, during the Bulgarian uprising of 1040, John the Eunuch was forced to arrest suspected plotters in Anatolia and he was unable to capture the Strategos of Theodosiopolis, who joined the rebellion and attempted to capture Thessalonica. In military affairs, Michaels reign began badly, the Arabs sacked Myra, the Serbs had thrown off Byzantine authority, and the Pechenegs were raiding almost at will up to the gates of Thessalonica. On the western front, in Sicily, Michael and John ordered the general George Maniakes to drive the Arabs out of the island, beginning in 1038, Maniakes landed in southern Italy and soon had captured Messina. He then began defeating the scattered Arab forces and taking towns in the west and south of the island, by 1040, he had stormed and taken Syracuse
