The military defeat of the Byzantine armies by the Seljuk Turks, which led to the Crusades, was the Battle of

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The Battle of Manzikert in 1071 was a significant military defeat of the Byzantine Empire by the Seljuk Turks, which opened up Anatolia to further conquest. This event is often cited as one of the factors that led to the Crusades. The Battle of the Tigris and the battles of Tours and Yathrib (also known as Medina) were significant in their own right but did not directly lead to the Crusades.

The Military Defeat of the Byzantine Armies by the Seljuk