Analysis of information sources in references of the Wikipedia article "معركة أنطاكية على مينيدر" in Arabic language version.
Theodore I had no choice but to fight. In the battle at Antioch at the Maeander the Nicaean army was almost defeated, but Laskaris met the sultan in person and after a short duel killed him. The battle took place after 15 June 1211, probably on 17 June.
