Xingqing

Xingging was a Chinese city located near the Xia province. In 1227, Genghis Khan besieged the city with his army, and established his camp. Learning that the Assassin Order sought his death, Khan tried to escape from his base, but was killed by Qulan Gal and Darim Ibn-La'Ahad.

Reference

 * Assassin's Creed: The Secret Crusade