The division of the Mongol Empire began when Möngke Khan died in 1259 with no declared successor, precipitating infighting between members of the Tolui family line for the title of Great Khan that escalated to the Toluid Civil War. This civil war, along with the Berke–Hulagu war and the subsequent Kaidu–Kublai war greatly weakened the authority of the Great Khan over the entirety of the Mongol Empire and the empire fractured into autonomous khanates, including the Golden Horde in the northwest, the Chagatai Khanate in the middle, the Ilkhanate in the southwest, and the Yuan dynasty in the east based in modern-day Beijing, although the Yuan emperors held the nominal title of Khagan of the empire. The four khanates each pursued their own separate interests and objectives, and fell at different times.