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The Byzantine Empire was the successor to the Roman Empire and ruled a large area in Europe and the Middle East. It was very important in the history of the Balkans and Russia especially and it kept the Arabs and the Muslims out of Europe for centuries. In 1071 the Empire seemed invincible, it had reversed many years of decline under a series of energetic Emperors. It had recovered many territories that had been lost to its enemies and was a powerful political and military force. The Battle of Manzikert was to change this and this article will argue that it led to the decline in the Byzantine Empire, the beginning of Turkish control in Asia Minor and directly led to the Crusades. The Battle was undoubtedly one of the most important in medieval history and its repercussions can still be felt to this day.

By 1050 the Byzantine Empire was a very strong state, with a highly professional army, sophisticated bureaucracy and extensive territories from northern Iraq to the Danube. The Empire had enjoyed a renaissance under the Macedonian Dynasty and especially under the capable Basil II. A common Greek Christian Orthodox Culture unified the diverse peoples’ of the realm, and this was exported to the Slavs of Eastern Europe. However, after the death of Basil II, the Macedonian dynasty came to an end and the Empire was led by a series of ineffectual Emperors and was devasted by several civil wars. In 1071 the Emperor was Romanus IV Diogenes (1068–1071), a member of the Cappadocian military aristocracy. He was an experienced general, but he had alienated many in the Byzantine aristocracy who saw him as a usurper and resented his authoritarianism. The strategic situation facing the Byzantine Empire was very dangerous. The Empire had appeared secure especially after its destruction of the Bulgar Empire. However, the Pencheng Turks, from the Eurasian Steppes threatened the Empire’s Balkan and Black Sea possessions. In Italy, the Normans were seizing the last remaining Byzantine possessions in Italy. The biggest threat to the Empire was posed by the Seljuk Turks. These had been nomads in Central Asia and had been converted to Islam about 1000 AD. The Turks were led by the Seljuk family and they invaded southwestern Asia in the 11th century<ref> A.C.S. Peacock and Sara Nur Yildiz, The Seljuks of Anatolia: Court and Society in the Medieval Middle East, (I.B. Tauris, 2015), p. 29 </ref>. They were able to defeat the various Muslim dynasties that had seized power after the decline of the Abbasid Caliphate. They founded an empire that included Mesopotamia, Syria, Palestine, and the majority of Iran. Their conquests were at the start of Turkish domination in the Middle East that was to last for centuries. The Seljuks attacked the Christian allies of the Byzantines in the Caucasus' and conquered Armenia. They also began to raid deep into Byzantine territory which they regarded as a Jihad and even managed to seize key fortresses on the Christian Empire’s territory.

[[File: Manzikert second one.jpg|200px|thumb|left| Alp Arslan placing his foot on the throat of Emperor Romanus, after Manzikert]]

The Seljuk raids into Anatolia was of great concern as this area was important for the Empire. Romanus needed its resources and the Anatolian provinces were the source of most of its military manpower. The Seljuk raids had led to the near collapse of the eastern frontier and many Turkish nomads had entered the area. The Emperor assembled a large army to reestablish the security of the Byzantine Empire’s regions. In 1071 Romanus led his army into areas of Armenia that had been seized by the Turks, with the aim of regaining key defensive fortresses <ref> Runciman. Steve. A History of the Crusades. — Cambridge University Press, 1987, vol. I) p. 62-63</ref>. Romanus’ army was mainly mounted heavy cavalry with some militia, it was also accompanied by large contingents of mercenaries. The tactics of Romanus was very unusual, as the Byzantine’s were usually reluctant to engage in offensive actions. Near the town of Manzikert, he divided his army, sending a large contingent to besiege a fortress <ref>Runciman, p. 70</ref>. The Seljuk army was under the command of Sultan Alp Arslan. The Turks had excellent intelligence and they were all mounted. When Alp Arslan heard that the Byzantines had divided his forces he rapidly advanced to Manzikert, where he confronted the emperor’s army, which he outnumbered <ref> Haldon, John. The Byzantine Wars: Battles and Campaigns of the Byzantine Era. Stroud: Tempus, 2001), p. 245</ref>. The Byzantines were taken completely by surprise and Romanus abandoned Manzikert, to reunite his forces. However, Alp Arslan attacked the Byzantine’s as they retreated, and his mounted archers inflicted heavy casualties on the Christians. Romanus had failed to scout the area and he had blundered into a trap. Romanus fought valiantly, and his men attacked the enemy with such ferocity that they seemed to be on the verge of victory. The Byzantines knights smashed into the lightly armored Turkish horsemen with great success. However, many of his mercenaries were Uz Turks and they defected to their kinsmen in the Seljuk army. One of the Byzantine generals saw this and decided to retreat, but other sources claimed that he retreated because of his personal hatred of the emperor <ref>Haldon p. 246</ref>. The Byzantine army was destroyed, and Romanus was taken, prisoner, and ritually humiliated. Alp Arslan after securing the submission of the Emperor treated Romanus very well and later released him. The absence of the Emperor from Byzantium and the defeat at Manzikert resulted in a usurper seizing power. Romanus tried to regain his realm but was defeated in battle, blinded and killed in 1072<ref>Haldon, p. 247</ref>.

The defeat in 10701 was a disaster for the Byzantines. The Turks in the aftermath of their victory over Romanus swept into Anatolia unopposed. They only faced local resistance from Byzantine lords in the Anatolian provinces. The Byzantine eastern frontier effectively collapsed and Turkish nomads entered Anatolia at will. Alp Arslan turned his attention to Fatimid Egypt fortunately for the Byzantines. In the immediate aftermath of the defeat of Manzikert there was no real effective Byzantine Emperor. This was a disaster as the state was very much dependent on the leadership of a strong Emperor <ref>Norwich, John Julius. Byzantium: The Apogee (London: Viking, 1991), p. 267</ref>. A series of civil wars devasted the Empire for a decade. Manzikert led to an unprecedented period of instability and this was perhaps the most important consequence of the Turkish victory. Indeed, the Byzantine Empire was only able to stabilize the situation under the capable Emperor Alexius I Comnenos. The lack of an effective government and endemic civil wars allowed the Turks to overrun many Byzantine cities and towns. The Byzantine army had been decimated at Manzikert and it had lost its elite forces. Many of these were impossible to replace as many had been highly trained and experienced cavalry<ref> Norwich, p. 278</ref>. To compound the disaster the loss of the Anatolian Provinces meant that the Byzantines could not recruit new soldiers. Provinces such as Cappadocia, which had long supplied the Christian Emperor with recruits were lost to the Turks, forever. <ref>Haldon, p. 312</ref>. Then the loss of the Anatolian provinces was a blow to the economy as it reduced the tax base of the Empire. This meant that the Byzantines were often in financial problems and this undermined their ability to defend themselves, especially as they were becoming more dependent on mercenaries after Manzikert. It is generally agreed that the defeat in 1071 can be regarded as the beginning of the end of the Byzantine Empire.

Byzantine emperor Alexios I Komnenos, concerned about the advances of the Turks in the aftermath of the defeat of Manzikert, sent envoys to the Pope in March 1095 to ask for aid against the Muslims. The Pope, Urban II responded favorably to the request for help from the Byzantines despite the Great Schism which had divided the Eastern and the Western Churches. The Pope may have hoped to reunify the Latin and the Greek Orthodox branches of Christianity<ref>Runciman p. 101</ref>. However, Urban II decided to urge Christian soldiers to travel to the Byzantine Lands and to fight the Turk and to regain the Hold Lands. This was not what Alexios wanted but soon a huge army of Crusaders was making its way across his remaining territories. This army managed to defeat the Turks and eventually conquered Jerusalem. The Crusades many argue helped to push back the Turks and to preserve the remaining lands of the Byzantine Empire. However, the Crusades were to take an unexpected turn. In 1204 the Fourth Crusade was diverted by the Venetians and it captured the Byzantine capital and this was a devastating blow to the Eastern Christian Empire<ref>Runciman, p. 213</ref>.

Because of the loss of the provinces in Anatolia after 1071, the Byzantine Empire sought support from the west. The Empire needed to raise revenues and to increase its trade. To do this they turned more and more to the West and especially to the rising maritime city-states in Italy, such as Amalfi, Genoa and especially Venice. These republics gradually began to dominate the economy and the trade of the Empire and this led to the decline of the Byzantine navy, which had once been the most feared in the Mediterranean<ref>Runciman, p. 234</ref>. By 1200 the Italians or ‘Latins’ had their own quarter in Byzantium and had many independent trading colonies in the Empire. Even after 1204 and the treachery of the Fourth Crusade the Byzantines had no choice but to turn to the Italians and others for help. Manzikert and the resulting loss of the Anatolian provinces led to the Greek Orthodox Empire becoming economically dependent on the Latin West which ultimately undermined its ability to defend itself from its many enemies.

Prior to the Battle of Manzikert, there had been no Turks in Anatolia. However, in the wake of the victory of Alp Arslan hordes of Turks entered the eastern part of the Byzantine Empire. The defeat leads to dramatic demographic changes in Anatolia. Turkish raiders drove the Greek and other Christian populations westwards and they virtually abandoned the Anatolian plateau to the interlopers. Individual Turkish tribes began to conquer lands after the Seljuk victory. Members of noble Turkish families began to organize the various Muslim freebooters and raiders and established emirates in the former eastern provinces of Byzantium. They often had good relations with the Byzantine Empire and eventually, a member of the Seljuk royal family established the Sultanate of Rum and broke from the Turkish Empire. During the Sultanate of Rum, many more Turkish nomads settled in Anatolia and the area became increasingly Turkish and Muslim and lost it old Greek and Christian character. Many locals even converted to Islam and adopted the customs of the invaders. The dissolution of the Rum Sultanate in the 14th century left behind many small Turkish principalities, among them that of the Ottoman dynasty. They, established an Empire in the Middle East and eventually capture Byzantium in 1453<ref>Haldon, p. 292</ref>.

The defeat of Emperor Romanus IV army at Manzikert was a disaster for the Byzantine Empire. Not only did it lead to the collapse of the Eastern Frontier but also a ten-year period of civil war. This led to Turkish raids and eventually settlement in Anatolia. The loss of the Eastern provinces meant that the Byzantines military and economic resources were depleted, and this made them vulnerable to their enemies in the east and the west. As a result, the Empire began to lose even more lands and it became dependent on westerners. One consequence of the battle was that a request for help by an Emperor to the Pope and this led to the Crusades. The Seljuk victory effectively left the Byzantines as a second-rate- power and an Empire only in name. The loss of the eastern provinces led to a period of irreversible decline for the Christian Eastern Empire. The defeat of the Byzantines at Manzikert allowed the Turks to occupy Anatolia and this led to both the establishment of the Ottoman Empire and ultimately the modern Turkish state.