What was the name of the Khwarezmian prince who escaped the Mongol conquest?

The Khwarezmian prince who escaped the Mongol conquest was Jalal ad-Din Mingburnu. He was the eldest surviving son and successor of Shah Muhammad II, whose Khwarezmian Empire was destroyed during Genghis Khan's invasion beginning in 1219.

After his father's death and the fall of major Khwarezmian cities, Jalal ad-Din gathered loyalists in Afghanistan. He defeated a Mongol army at the Battle of Parwan in 1221, but internal disputes caused part of his coalition to desert. Genghis Khan then personally pursued him and defeated his reduced forces at the Battle of the Indus.

Jalal ad-Din escaped by crossing the Indus River into India, where he established a temporary power base. He later returned westward and ruled territories in Iran, Azerbaijan, and parts of the Caucasus. His resistance made him one of the most persistent opponents of the Mongols, although he could not restore the old Khwarezmian Empire.

His name appears in several transliterations, including Mingburnu, Mangburni, and Mengübirni. These variants refer to the same historical ruler, not different princes.