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The Byzantine Empire was destroyed.
The collapse of the Western Roman Empire opened the Byzantine Empire to being attacked as well. The resources and troops were used for that, rather than being used to defeat the Persians.
Alexius I, Byzantine emperor, appealed to Christian Europe for military aid against the Muslim Seljuk Turks, who he was afraid were going to overrun his empire and perhaps even conquer Constantinople.
The eastern part of the Roman empire was known as the Byzantine empire.The eastern part of the Roman empire was known as the Byzantine empire.The eastern part of the Roman empire was known as the Byzantine empire.The eastern part of the Roman empire was known as the Byzantine empire.The eastern part of the Roman empire was known as the Byzantine empire.The eastern part of the Roman empire was known as the Byzantine empire.The eastern part of the Roman empire was known as the Byzantine empire.The eastern part of the Roman empire was known as the Byzantine empire.The eastern part of the Roman empire was known as the Byzantine empire.
The Byzantine empire was the Roman empire, merely its eastern counterpart.
Alexios I Komnenos, Emperor of the Byzantine Empire, called upon Western European Christians to help him defeat the Seljuk Turks in what eventually became the First Crusade.
The Crusades began soon after the Seljuk Turks threatened the Byzantine Empire, a Christian nation and a key ally of Western Europe. The Seljuk Turks' conquests in Anatolia and their capture of Jerusalem sparked a call for the Crusades to reclaim these territories.
The Seljuk Turks were a large and threatening force in the Middle East during the Middle Ages, and the Byzantine Empire suffered a crippling defeat at their hands at the Battle of Manzikert in 1071. Taking advantage of this victory and the ensuing turmoil within the Empire, the Turks were able to seize most of Asia Minor and remained a threat to the Byzantines for the remainder of the Empire's existence. It was, in fact, a Turkish nation that dealt the death blow to the Byzantine Empire in 1453.
Seljuk Turks
The Byzantine Empire was destroyed.
The Byzantine Empire had been growing steadily smaller and weaker for centuries, but it was finally defeated altogether by the Ottoman Turks in 1453.
The Ottoman Turks.
The Seljuk Turks used Nicaea as the capital of their Seljuk Empire beginning in 1081; in 1097, Nicaea fell back into Byzantine control. In 1204, after the Fourth Crusade, the Laskaris family made Nicaea the capital of their Empire of Nicaea. This empire lasted until 1261.
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The Ottoman Empire, but truthfully due to a series of civil wars and partial defeats by other empires the Byzantine empire had been in decline for centuries prior to their final defeat