Jalal ad-Din Mingburnu
After destroying the Khwarazmian empire, Genghis Khan was free to move against Western Xia. In 1226, however, Jalal ad-Din Mingburnu, the last of the Khwarizm monarchs, returned to Persia to revive the empire lost by his father, Muhammad ‘Ala al-Din II. The Mongol forces sent against him in 1227 were defeated at Dameghan. Another army that marched against Jalal al-Din scored a pyrrhic victory in the vicinity of Isfahan but was unable to follow up that success.