The Berke–Hulagu war was a civil war in the Mongol Empire which fought between two Mongol leaders: Berke Khan of the Golden Horde, and Hulagu Khan of the Ilkhanate. It was fought mostly in the Caucasus mountains area in the 1260s after the destruction of Baghdad in 1258. The war marked a key moment in the fragmentation of the Mongol Empire after the death of the Great Khan Mongke.