( 1077-1231) Dynasty that ruled Central Asia and Iran, first as vassals of the Seljq dynasty and then independently. It was founded by a slave, An tegin Gharacha, who was appointed governor of Khwrezm. At its peak under Al al-Dn Muammad (r. 1200-20) and his son Jall al-Dn Mingburnu (1220-31), the dynasty's territory extended from India to Anatolia. It fell to Genghis Khan in 1231