1.
Piston
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A piston is a component of reciprocating engines, reciprocating pumps, gas compressors and pneumatic cylinders, among other similar mechanisms. It is the component that is contained by a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to force from expanding gas in the cylinder to the crankshaft via a piston rod and/or connecting rod. In a pump, the function is reversed and force is transferred from the crankshaft to the piston for the purpose of compressing or ejecting the fluid in the cylinder, in some engines, the piston also acts as a valve by covering and uncovering ports in the cylinder wall. An internal combustion engine is acted upon by the pressure of the combustion gases in the combustion chamber space at the top of the cylinder. This force then acts downwards through the rod and onto the crankshaft. The connecting rod is attached to the piston by a swivelling gudgeon pin and this pin is mounted within the piston, unlike the steam engine, there is no piston rod or crosshead. The pin itself is of hardened steel and is fixed in the piston, a few designs use a fully floating design that is loose in both components. All pins must be prevented from moving sideways and the ends of the pin digging into the cylinder wall, gas sealing is achieved by the use of piston rings. These are a number of iron rings, fitted loosely into grooves in the piston. The rings are split at a point in the rim, allowing them to press against the cylinder with a light spring pressure. Two types of ring are used, the rings have solid faces and provide gas sealing, lower rings have narrow edges. There are many proprietary and detail design features associated with piston rings, pistons are cast from aluminium alloys. For better strength and fatigue life, some racing pistons may be forged instead, early pistons were of cast iron, but there were obvious benefits for engine balancing if a lighter alloy could be used. To produce pistons that could survive engine combustion temperatures, it was necessary to develop new alloys such as Y alloy and Hiduminium, a few early gas engines had double-acting cylinders, but otherwise effectively all internal combustion engine pistons are single-acting. During World War II, the US submarine Pompano was fitted with a prototype of the infamously unreliable H. O. R, although compact, for use in a cramped submarine, this design of engine was not repeated. Media related to Internal combustion engine pistons at Wikimedia Commons Trunk pistons are long relative to their diameter and they act both as a piston and cylindrical crosshead. As the connecting rod is angled for much of its rotation, a longer piston helps to support this
2.
Crank (mechanism)
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A crank is an arm attached at a right angle to a rotating shaft by which reciprocating motion is imparted to or received from the shaft. It is used to convert circular motion into reciprocating motion, or vice versa, the arm may be a bent portion of the shaft, or a separate arm or disk attached to it. Attached to the end of the crank by a pivot is a rod, the end of the rod attached to the crank moves in a circular motion, while the other end is usually constrained to move in a linear sliding motion. The term often refers to a crank which is used to manually turn an axle, as in a bicycle crankset or a brace. In this case a persons arm or leg serves as the connecting rod, there is usually a bar perpendicular to the other end of the arm, often with a freely rotatable handle or pedal attached. Familiar examples include, Mechanical pencil sharpener Fishing reel and other reels for cables, wires, ropes, manually operated car window The carpenters brace is a compound crank. The crank set that drives a handcycle through its handles, the crankset that drives a bicycle via the pedals. Treadle sewing machine Almost all reciprocating engines use cranks to transform the motion of the pistons into rotary motion. The cranks are incorporated into a crankshaft, the displacement of the end of the connecting rod is approximately proportional to the cosine of the angle of rotation of the crank, when it is measured from top dead center. The mechanical advantage of a crank, the ratio between the force on the rod and the torque on the shaft, varies throughout the cranks cycle. The relationship between the two is approximately, τ = F r sin where τ is the torque and F is the force on the connecting rod. But in reality, the torque is maximum at crank angle of less than α = 90° from TDC for a force on the piston. One way to calculate this angle is to find out when the Connecting rod smallend speed becomes the fastest in downward direction given a steady crank rotational velocity. 17615° after TDC. Then, using the sine law, it is found that the crank to connecting rod angle is 88. 21738°. When the crank is driven by the rod, a problem arises when the crank is at top dead centre or bottom dead centre. At these points in the cycle, a force on the connecting rod causes no torque on the crank. Therefore, if the crank is stationary and happens to be at one of two points, it cannot be started moving by the connecting rod. The eccentrically mounted handle of the rotary handmill which appeared in 5th century BC Celtiberian Spain, a Roman iron crank of yet unknown purpose dating to the 2nd century AD was excavated in Augusta Raurica, Switzerland
3.
Steam engine
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A steam engine is a heat engine that performs mechanical work using steam as its working fluid. Steam engines are combustion engines, where the working fluid is separate from the combustion products. Non-combustion heat sources such as power, nuclear power or geothermal energy may be used. The ideal thermodynamic cycle used to analyze this process is called the Rankine cycle, in the cycle, water is heated and transforms into steam within a boiler operating at a high pressure. When expanded through pistons or turbines, mechanical work is done, the reduced-pressure steam is then exhausted to the atmosphere, or condensed and pumped back into the boiler. Specialized devices such as hammers and steam pile drivers are dependent on the steam pressure supplied from a separate boiler. The use of boiling water to mechanical motion goes back over 2000 years. The Spanish inventor Jerónimo de Ayanz y Beaumont obtained the first patent for an engine in 1606. In 1698 Thomas Savery patented a steam pump that used steam in direct contact with the water being pumped, Saverys steam pump used condensing steam to create a vacuum and draw water into a chamber, and then applied pressurized steam to further pump the water. Thomas Newcomens atmospheric engine was the first commercial steam engine using a piston. In 1781 James Watt patented an engine that produced continuous rotary motion. Watts ten-horsepower engines enabled a range of manufacturing machinery to be powered. The engines could be sited anywhere that water and coal or wood fuel could be obtained, by 1883, engines that could provide 10,000 hp had become feasible. The stationary steam engine was a key component of the Industrial Revolution, the aeolipile described by Hero of Alexandria in the 1st century AD is considered to be the first recorded steam engine. Torque was produced by steam jets exiting the turbine, in the Spanish Empire, the great inventor Jerónimo de Ayanz y Beaumont obtained a patent for the first steam engine in history in 1603. Thomas Savery, in 1698, patented the first practical, atmospheric pressure and it had no piston or moving parts, only taps. It was an engine, a kind of thermic syphon, in which steam was admitted to an empty container. The vacuum thus created was used to water from the sump at the bottom of the mine
4.
Anatolia
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Anatolia, in geography known as Asia Minor, Asian Turkey, Anatolian peninsula, or Anatolian plateau, is the westernmost protrusion of Asia, which makes up the majority of modern-day Turkey. The region is bounded by the Black Sea to the north, the Mediterranean Sea to the south, the Sea of Marmara forms a connection between the Black and Aegean Seas through the Bosphorus and Dardanelles straits and separates Anatolia from Thrace on the European mainland. Traditionally, Anatolia is considered to extend in the east to a line between the Gulf of Alexandretta and the Black Sea to the Armenian Highlands, thus, traditionally Anatolia is the territory that comprises approximately the western two-thirds of the Asian part of Turkey. The Turkification of Anatolia began under the Seljuk Empire in the late 11th century, however, various non-Turkic languages continue to be spoken by minorities in Anatolia today, including Kurdish, Assyrian, Armenian, Arabic, Laz, Georgian, and Greek. Traditionally, Anatolia is considered to extend in the east to a line running from the Gulf of Alexandretta to the Black Sea. This traditional geographical definition is used, for example, in the latest edition of Merriam-Websters Geographical Dictionary, under this definition, Anatolia is bounded to the east by the Armenian Highlands, and the Euphrates before that river bends to the southeast to enter Mesopotamia. To the southeast, it is bounded by the ranges that separate it from the Orontes valley in Syria, the first name the Greeks used for the Anatolian peninsula was Ἀσία, presumably after the name of the Assuwa league in western Anatolia. As the name of Asia came to be extended to areas east of the Mediterranean. The name Anatolia derives from the Greek ἀνατολή meaning “the East” or more literally “sunrise”, the precise reference of this term has varied over time, perhaps originally referring to the Aeolian, Ionian and Dorian colonies on the west coast of Asia Minor. In the Byzantine Empire, the Anatolic Theme was a theme covering the western, the modern Turkish form of Anatolia is Anadolu, which again derives from the Greek name Aνατολή. The Russian male name Anatoly and the French Anatole share the same linguistic origin, in English the name of Turkey for ancient Anatolia first appeared c. It is derived from the Medieval Latin Turchia, which was used by the Europeans to define the Seljuk controlled parts of Anatolia after the Battle of Manzikert. Human habitation in Anatolia dates back to the Paleolithic, neolithic Anatolia has been proposed as the homeland of the Indo-European language family, although linguists tend to favour a later origin in the steppes north of the Black Sea. However, it is clear that the Anatolian languages, the oldest branch of Indo-European, have spoken in Anatolia since at least the 19th century BC. The earliest historical records of Anatolia stem from the southeast of the region and are from the Mesopotamian-based Akkadian Empire during the reign of Sargon of Akkad in the 24th century BC, scholars generally believe the earliest indigenous populations of Anatolia were the Hattians and Hurrians. The region was famous for exporting raw materials, and areas of Hattian-, one of the numerous cuneiform records dated circa 20th century BC, found in Anatolia at the Assyrian colony of Kanesh, uses an advanced system of trading computations and credit lines. They were speakers of an Indo-European language, the Hittite language, originating from Nesa, they conquered Hattusa in the 18th century BC, imposing themselves over Hattian- and Hurrian-speaking populations. According to the most widely accepted Kurgan theory on the Proto-Indo-European homeland, however, the Hittites adopted the cuneiform script, invented in Mesopotamia
5.
Turkey
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Turkey, officially the Republic of Turkey, is a transcontinental country in Eurasia, mainly in Anatolia in Western Asia, with a smaller portion on the Balkan peninsula in Southeast Europe. Turkey is a democratic, secular, unitary, parliamentary republic with a cultural heritage. The country is encircled by seas on three sides, the Aegean Sea is to the west, the Black Sea to the north, and the Mediterranean Sea to the south. The Bosphorus, the Sea of Marmara, and the Dardanelles, Ankara is the capital while Istanbul is the countrys largest city and main cultural and commercial centre. Approximately 70-80% of the countrys citizens identify themselves as ethnic Turks, other ethnic groups include legally recognised and unrecognised minorities. Kurds are the largest ethnic minority group, making up approximately 20% of the population, the area of Turkey has been inhabited since the Paleolithic by various ancient Anatolian civilisations, as well as Assyrians, Greeks, Thracians, Phrygians, Urartians and Armenians. After Alexander the Greats conquest, the area was Hellenized, a process continued under the Roman Empire. The Seljuk Sultanate of Rûm ruled Anatolia until the Mongol invasion in 1243, the empire reached the peak of its power in the 16th century, especially during the reign of Suleiman the Magnificent. During the war, the Ottoman government committed genocides against its Armenian, Assyrian, following the war, the conglomeration of territories and peoples that formerly comprised the Ottoman Empire was partitioned into several new states. Turkey is a member of the UN, an early member of NATO. Turkeys growing economy and diplomatic initiatives have led to its recognition as a regional power while her location has given it geopolitical, the name of Turkey is based on the ethnonym Türk. The first recorded use of the term Türk or Türük as an autonym is contained in the Old Turkic inscriptions of the Göktürks of Central Asia, the English name Turkey first appeared in the late 14th century and is derived from Medieval Latin Turchia. Similarly, the medieval Khazar Empire, a Turkic state on the shores of the Black. The medieval Arabs referred to the Mamluk Sultanate as al-Dawla al-Turkiyya, the Ottoman Empire was sometimes referred to as Turkey or the Turkish Empire among its European contemporaries. The Anatolian peninsula, comprising most of modern Turkey, is one of the oldest permanently settled regions in the world, various ancient Anatolian populations have lived in Anatolia, from at least the Neolithic period until the Hellenistic period. Many of these peoples spoke the Anatolian languages, a branch of the larger Indo-European language family, in fact, given the antiquity of the Indo-European Hittite and Luwian languages, some scholars have proposed Anatolia as the hypothetical centre from which the Indo-European languages radiated. The European part of Turkey, called Eastern Thrace, has also been inhabited since at least forty years ago. It is the largest and best-preserved Neolithic site found to date, the settlement of Troy started in the Neolithic Age and continued into the Iron Age
6.
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
7.
Sawmill
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A sawmill or lumber mill is a facility where logs are cut into lumber. Prior to the invention of the sawmill, boards were rived and planed, the earliest known mechanical mill is the Hierapolis sawmill, a Roman water-powered stone mill at Hierapolis, Asia Minor dating back to the 3rd century AD. Other water-powered mills followed and by the 11th century they were widespread in Spain and North Africa, the Middle East and Central Asia, the circular motion of the wheel was converted to a reciprocating motion at the saw blade. Generally, only the saw was powered, and the logs had to be loaded and moved by hand, an early improvement was the development of a movable carriage, also water powered, to move the log steadily through the saw blade. Scrap lumber from the mill provided a source of fuel for firing the boiler, the arrival of railroads meant that logs could be transported to mills rather than mills being built besides navigable waterways. Besides the sawn timber, use is made of all the by-products including sawdust, bark, wood chips, a sawmills basic operation is much like those of hundreds of years ago, a log enters on one end and dimensional lumber exits on the other end. After trees are selected for harvest, the step in logging is felling the trees. Branches are cut off the trunk, logs are taken by logging truck, rail or a log drive to the sawmill. Logs are scaled either on the way to the mill or upon arrival at the mill, debarking removes bark from the logs. Decking is the process for sorting the logs by species, size, a sawyer uses a head saw to break the log into cants and flitches. Trimming squares the ends at typical lumber lengths, drying removes naturally occurring moisture from the lumber. This can be done with kilns or air-dried, planing smooths the surface of the lumber leaving a uniform width and thickness. Shipping transports the lumber to market. The Hierapolis sawmill, a Roman water-powered stone saw mill at Hierapolis and it is also the earliest known machine to incorporate a crank and connecting rod mechanism. Water-powered stone sawmills working with cranks and connecting rods, but without gear train, are attested for the 6th century AD at the Eastern Roman cities Gerasa. The earliest literary reference to a working sawmill comes from a Roman poet, at one point in the poem he describes the shrieking sound of a watermill cutting marble. Marble sawmills also seem to be indicated by the Christian saint Gregory of Nyssa from Anatolia around 370/390 AD, sawmills became widespread in medieval Europe again, as one was sketched by Villard de Honnecourt in c. They are claimed to have introduced to Madeira following its discovery in c.1420
8.
Ephesus
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Ephesus was an ancient Greek city on the coast of Ionia, three kilometres southwest of present-day Selçuk in İzmir Province, Turkey. It was built in the 10th century BC on the site of the former Arzawan capital by Attic, during the Classical Greek era it was one of the twelve cities of the Ionian League. The city flourished after it came under the control of the Roman Republic in 129 BC, the city was famed for the nearby Temple of Artemis, one of the Seven Wonders of the Ancient World. Among many other buildings are the Library of Celsus. Ephesus was one of the seven churches of Asia that are cited in the Book of Revelation, the Gospel of John may have been written here. The city was the site of several 5th century Christian Councils, the city was destroyed by the Goths in 263, and although rebuilt, the citys importance as a commercial centre declined as the harbour was slowly silted up by the Küçükmenderes River. It was partially destroyed by an earthquake in 614 AD, the area surrounding Ephesus was already inhabited during the Neolithic Age, as was revealed by excavations at the nearby höyük of Arvalya and Cukurici. Excavations in recent years have unearthed settlements from the early Bronze Age at Ayasuluk Hill, according to Hittite sources, the capital of the Kingdom of Arzawa was Apasa. Some scholars suggest that this is the later Greek Ephesus, in 1954, a burial ground from the Mycenaean era with ceramic pots was discovered close to the ruins of the basilica of St. John. This was the period of the Mycenaean Expansion when the Achaioi settled in Asia Minor during the 14th and 13th centuries BC, Ephesus was founded as an Attic-Ionian colony in the 10th century BC on the Ayasuluk Hill, three kilometers from the centre of ancient Ephesus. The mythical founder of the city was a prince of Athens named Androklos, according to the legend, he founded Ephesus on the place where the oracle of Delphi became reality. Androklos drove away most of the native Carian and Lelegian inhabitants of the city and he was a successful warrior, and as a king he was able to join the twelve cities of Ionia together into the Ionian League. During his reign the city began to prosper and he died in a battle against the Carians when he came to the aid of Priene, another city of the Ionian League. Androklos and his dog are depicted on the Hadrian temple frieze, later, Greek historians such as Pausanias, Strabo and Herodotos and the poet Kallinos reassigned the citys mythological foundation to Ephos, queen of the Amazons. The Greek goddess Artemis and the great Anatolian goddess Kybele were identified together as Artemis of Ephesus, Pausanias mentions that the temple was built by Ephesus, son of the river god Caystrus, before the arrival of the Ionians. Of this structure, scarcely a trace remains, about 650 BC, Ephesus was attacked by the Cimmerians who razed the city, including the temple of Artemis. After the Cimmerians had been away, the city was ruled by a series of tyrants. Following a revolt by the people, Ephesus was ruled by a council and his signature has been found on the base of one of the columns of the temple
9.
Roman Syria
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Syria was an early Roman province, annexed to the Roman Republic in 64 BC by Pompey in the Third Mithridatic War, following the defeat of Armenian King Tigranes the Great. Following the partition of the Herodian Kingdom into tetrarchies in 6 AD, it was absorbed into Roman provinces, with Roman Syria annexing Iturea. Later, in 135 AD, in the aftermath of the Bar Kokhba revolt, Syrian province was merged with Judea province, one province During the early empire, the Roman army in Syria accounted for three legions with auxiliaries, they defended the border with Parthia. Syrian province forces were engaged in the Great Jewish Revolt of 66–70 AD. In 66 AD, Cestius Gallus, the legate of Syria, brought the Syrian army, based on XII Fulminata, reinforced by troops, to restore order in Judaea. The legion, however, was ambushed and destroyed by Jewish rebels at the Battle of Beth Horon, the future emperor Vespasian was put in charge of subduing the Jewish revolt. In the summer of 69, Vespasian, with the Syrian units supporting him, the governor of Syria retained the civil administration of the whole large province undiminished, and held for long alone in all Asia a command of the first rank. It was Severus who at length withdrew the first place in the Roman military hierarchy from the Syrian governor, the emperor Septimius Severus divided up Roman Syria in the fashion it would remain until the rule of the Tetrarchs. From the later 2nd century, the Roman senate included several notable Syrians, Syria was of crucial strategic importance during the crisis of the third century. In 244 AD, Rome was ruled by a native Syrian from Philippopolis in the province of Arabia Petraea, the emperor was Marcus Iulius Philippus, more commonly known as Philip the Arab. Philip became the 33rd emperor of Rome upon its millennial celebration, in 259/260 a similar event happened when Shapur I again defeated a Roman field army and captured the Roman emperor, Valerian, alive at the battle of Edessa. Again Roman Syria suffered as cities were captured, sacked and pillaged, from 268 to 273, Syria was part of the breakaway Palmyrene Empire. Following the reforms of Diocletian, Syria Coele became part of the Diocese of Oriens, after c.415 Syria Coele was further subdivided into Syria I, with the capital remaining at Antioch, and Syria II or Syria Salutaris, with capital at Apamea on the Orontes. In 528, Justinian I carved out the coastal province Theodorias out of territory from both provinces. The region remained one of the most important provinces of the Byzantine Empire and it was occupied by the Sassanids between 609 and 628, then recovered by the emperor Heraclius, but lost again to the advancing Muslims after the battle of Yarmouk and the fall of Antioch. The city of Antioch was recovered in 963 AD along with other parts of the country. A reconquest undertaken by the Fatimad caliphate in the 970s retook most parts of Syria from the Byzantines, however, the Byzantine emperor Basil II reconquered all of Syria from Muslims by 1000 AD. Frequent rebellions, however, weakened Byzantine control over Syria, by 1045 only the city of Antioch remained Byzantine
10.
Artuqids
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The Artquids or Artuqid dynasty was a Turkmen dynasty that ruled in Eastern Anatolia, Northern Syria and Northern Iraq in the eleventh and twelfth centuries. The Artuqid dynasty took its name from its founder, Zaheer-ul-Daulah Artuk Bey, the Artuqid rulers viewed the state as the common property of the dynasty members. Artuqid rulers commissioned many buildings, such as mosques, bazaars, bridges, hospitals. They left an important cultural heritage by contributing to literature and the art of metalworking, the door and door handles of the great Mosque of Cizre are unique examples of Artuqid metal working craftsmanship, which can be seen in the Turkish and Islamic Arts Museum in Istanbul, Turkey. The dynasty was founded by Artuk Bey, son of Eksük, Tutush appointed Artuq governor of Jerusalem in 1086. Artuq died in 1091, and his sons Sökmen and Ilghazi were expelled from Jerusalem by the Fatimid vizier al-Afdal Shahanshah in 1098, the Fatimids lost the city to the crusaders the following year. Sokman and Ilghazi set themselves up in Diyarbakır, Mardin, and Hasankeyf in the Jezirah, Sokman, bey of Mardin, defeated the crusaders at the Battle of Harran in 1104. Ilghazi succeeded Sokman in Mardin and imposed his control over Aleppo at the request of the qadi Ibn al-Khashshab in 1118, in 1119 Ilgazi defeated the crusader Principality of Antioch at the Battle of Ager Sanguinis. In 1121 a Seljuq-Artuqid alliance, commanded by Mehmed I of Great Seljuq, Ilghazi died in 1122, and although his nephew Balak nominally controlled Aleppo, the city was really controlled by Ibn al-Khashshab. Al-Kashshab was assassinated in 1125, and Aleppo fell under the control of Zengi of Mosul, after the death of Balak, the Artuqids were split between Harput, Hasankeyf and Mardin. Sokmans son Davud, bey of Hasankeyf, died in 1144, Kara Aslan allied with Joscelin II of Edessa against the Zengids, and while Joscelin was away in 1144, Zengi recaptured Edessa, the first of the Crusader states to fall. Hasankeyf became a vassal of Zengi as well, Kara Aslans son Nur ad-Din Muhammad allied with the Ayyubid sultan Saladin against the Sultan of Rum Kilij Arslan II, whose daughter had married Nur ad-Din Muhammad. In the peace settlement with Kilij Arslan, Saladin gained control of the Artuqid territory, even though the Artuqids were still technically vassals of Mosul, with Artuqid support, however, Saladin eventually took control of Mosul as well. The Artuklu dynasty remained in command of upper Mesopotamia. The Hasankeyf branch conquered Diyarbakır in 1198 and its center was moved here, the Harput branch was destroyed by the Sultanate of Rum due to following a slippery policy between the Ayyubids and Seljuqs. The Mardin branch survived for longer, but as a vassal of the Ayyubids, Sultanate of Rum, Il-Khanate, karakoyunlu captured Mardin and finally put an end to Artuklu rule in 1409. Despite their constant preoccupation with war, members of the Artuklu dynasty left many architectural monuments and they made the most significant additions to Diyarbakır City Walls. Urfa Gate was rebuilt by Muhammad, son of Kara Arslan, a large caravanserai in Mardin as well as the civil engineering feat of Malabadi Bridge are still in regular use in our day
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