昆明湖
In 1215, after a bitter siege in which many of the city's inhabitants starved, Zhongdu's 100,000 defenders and 108,000 households surrendered. The city was still looted and burned by the invaders. Zhongdu was renamed Yanjing and its population shrank to 91,000 in 1216 (with 285,000 in the surrounding region). Among the captives taken from the city was a Khitan named Yelü Chucai, who persuaded Genghis Khan that while China could be conquered from the saddle, it could not be ruled from the saddle. Rather than converting northern China into pastures, it would be more beneficial for Mongols to tax the agrarian population. Genghis Khan heeded the advice and the Mongol pillaging eased. The Mongols continued to the war against the Jurchens until the capture of Kaifeng in 1234 ended the Jin dynasty. Yelü Chucai was buried on the east bank of Kunming Lake in what is now the Summer Palace.