The Byzantine Empire (or Byzantium) was the Eastern Roman Empire during Late Antiquity and the Middle Ages, centered on the capital of Constantinople. Known simply as the "Roman Empire" (Greek: Βασιλεία Ῥωμαίων, Basileia Rhōmaiōn;Latin: Imperium Romanum) or Romania (Ῥωμανία) to its inhabitants and neighbours, it was the direct continuation of the Ancient Roman State and maintained Roman state traditions. Byzantium is today distinguished from ancient Rome proper insofar as it was oriented towards Greek culture, characterised by Christianity rather than Roman polytheism, and was predominantly Greek-speaking rather than Latin-speaking.
As the distinction between Roman Empire and Byzantine Empire is largely a modern convention, it is not possible to assign a date of separation; however, important points are the Roman Empire's administrative division into western and eastern halves in 285 by Emperor Diocletian (r. 284–305), and Emperor Constantine I's (r. 306–337) decision in 324 to transfer the capital from Nicomedia (in Asia Minor) to Byzantium on the Bosphorus, which became Constantinople, "City of Constantine" (alternatively "New Rome"). The Roman Empire was finally divided in 395 AD after the death of Emperor Theodosius I (r. 379–395), thus this date is also very important if the Byzantine Empire (or Eastern Roman Empire) is looked upon as completely separated from the West. The transition to Byzantine history proper finally begins during the reign of Emperor Heraclius (r. 610–641), since Heraclius effectively established a new state after reforming the army and administration by introducing themes and by changing the official language of the Empire from Latin to Greek.
Manuel I Komnenos (or Comnenus) (Greek: Μανουήλ Α' Κομνηνός, Manouēl I Komnēnos) (28 November 1118 – 24 September 1180) was a Byzantine Emperor of the 12th century who reigned over a crucial turning point in the history of Byzantium and the Mediterranean.
Eager to restore his empire to its past glories as the superpower of the Mediterranean world, Manuel pursued an energetic and ambitious foreign policy. In the process he made alliances with the Pope and the resurgent west, invaded Italy, successfully handled the passage of the dangerous Second Crusade through his empire, and established a Byzantine protectorate over the Crusader states of Outremer.
Facing Muslim advances in the Holy Land, he made common cause with the Kingdom of Jerusalem and participated in a combined invasion of Fatimid Egypt.
Manuel reshaped the political maps of the Balkans and the east Mediterranean, placing the kingdoms of Hungary and Outremer under Byzantine hegemony and campaigning aggressively against his neighbours both in the west and in the east. However, towards the end of his reign Manuel's achievements in the east were compromised by a serious defeat at Myriokephalon, which in large part resulted from his arrogance in attacking a well-defended Seljuk position.
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