Seljuk Victory at the Battle of Manzikert
On August 26, 1071, the Byzantine army of Emperor Romanos IV Diogenes clashed with Seljuk Turkish forces under Alp Arslan near Manzikert in eastern Anatolia. The Byzantines suffered a crushing defeat, and Romanos himself was captured on the field. According to medieval chroniclers, the loss shattered Byzantine military prestige and opened much of Anatolia to gradual Turkic settlement. The battle is often cited as a turning point that weakened the empire and helped set the stage for later Crusades.