(1071) Battle near the town of Manzikert (present-day Malazgirt, Turk.), in which the Seljuq Turks (see Seljuq dynasty ) under Sultan Alp-Arslan defeated the Byzantines under Romanus IV Diogenes .
Romanus had assembled a large army to confront the Turks and end their forays into Byzantine-ruled Anatolia. His troops included Turkmen mercenaries who deserted to the enemy the night before the battle; the Turks destroyed the Byzantine army and took Romanus prisoner. The battle was followed by the Seljuq conquest of most of Anatolia.