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Syria is reclaimed by the Muslims
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Alexius appeals to Urban II at Council of Piacenza for help against the Turks. The First Crusade is proclaimed at Council of Clermont.
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Crusaders arrive at Constantinople. The Crusaders are successful, but eventually withdraw from cooperation with the Byzantines.
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1204: Fourth Crusade captures Constantinople. The Latin Empire of Constantinople is formed as well as many Byzantine successor states. The capture of Constantinople in 1204 was a blow from which the Byzantines never fully recovered.
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995: Basil II reconquers Syria from the Muslims. Reclaiming land for the Byzantine Empire.
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Basil II recaptures Greece from the Bulgars, expanding the empire