Mongol invasions of Georgia and Armenia, then consisting of the Georgia, Armenia, and dominated much of the Caucasus, involved multiple invasions and large-scale raids throughout the 13th century. The Mongol Empire first appeared in the Caucasus in 1220 as generals Subutai and Jebe pursued Muhammad II of Khwarezm during the destruction of the Khwarezmian Empire. After a series of raids in which they defeated the Georgian and Armenian armies, Subutai and Jebe continued north to invade Kievan Rus'. After his empire was destroyed, Khwarazm ruler Jalal ad-Din Mingburnu, son of Muhammed II, battled both the Mongols and the Georgians before moving on to challenge the Seljuks in Anatolia. A full-scale Mongol conquest of the Caucasus and eastern Anatolia began in 1236, in which the Kingdom of Georgia, the Sultanate of Rum, and the Empire of Trebizond were subjugated, the Armenian Kingdom of Cilicia and other Crusader states voluntarily accepted Mongol vassalage, and the Assassins were eliminated. The Mongols also invaded Dzurdzuketia, modern-day Chechnya, but faced continual resistance in that area. After the death of Möngke Khan in 1259, the Mongol Empire descended into civil war and Berke of the Golden Horde and Hulagu of the Ilkhanate repeatedly invaded each other in the Caucasus until the ascension of Kublai Khan in 1264.