Which 1071 battle saw Byzantine emperor Romanos IV captured by the Seljuk Turks?

The Battle of Manzikert in 1071 saw Byzantine emperor Romanos IV Diogenes captured by the Seljuk Turks. Fought on 26 August near modern Malazgirt in eastern Turkey, the battle ended in a major Byzantine defeat and a rare imperial captivity.

Romanos had led a large army into Armenia to recover fortresses and check Seljuk expansion. The Seljuk sultan Alp Arslan rapidly brought his forces to meet him. Byzantine formations broke apart during the fighting, and Romanos was wounded and captured after the imperial center was surrounded.

Alp Arslan treated the defeated emperor comparatively generously and negotiated terms for his release. The battle did not cause the immediate collapse of Byzantine Anatolia, but Romanos’s defeat was followed by civil war and political instability. Those conflicts weakened the empire’s ability to defend Asia Minor, allowing Turkic settlement and Seljuk power to expand.

Manzikert is sometimes portrayed as a single decisive turning point that instantly “lost” Anatolia. The longer-term transformation took decades and involved Byzantine civil conflict, frontier migration, and continued warfare.