Summer – Emperor Manuel I (Komnenos) assembles a Byzantine expeditionary force, and marches towards Iconium, the Seljuk capital. Meanwhile, hordes of Seljuk Turks destroy crops and poison water supplies, to make Manuel's march more difficult, and harass the Byzantine army, in order to force it into the Meander Valley. Kilij Arslan II, ruler of the Sultanate of Rum, hears of the expedition, and sends envoys to ask for peace.[1]
September 17 – Battle of Myriokephalon: The Seljuk Turks defeat the Byzantine forces led by Manuel I, who are ambushed when moving through a narrow mountain pass near Lake Beyşehir. The Byzantines are dispersed and surrounded. They suffer heavy casualties and their siege equipment is destroyed. Manuel flees in panic and is forced to sign a peace treaty with Kilij Arslan II.[2]
Al-Adil I, Ayyubid governor of Egypt, suppresses a revolt by the Christian Copts in the city of Qift, hanging nearly 3,000 of them on the trees near the city.