The Mongol army under Genghis Khan, generals and his sons crossed the Tien Shan mountains by entering the area controlled by the Khwarezmian Empire.
The Khwarazmian dynasty (also known as the Khwarezmid dynasty, dynasty of Khwarazm Shahs, and other spelling variants; from Persian خوارزمشاهیان Khwārazmshāhiyān, "Kings of Khwarezmia") was a Persianate Sunni Muslim dynasty of Turkic mamluk origin