Jalal ad-Din Mingburnu
In 1219, in retaliation for the murders of his ambassadors, the Mongol Khan, Genghis Khan, invaded the Khwarezmian Empire. In a campaign that lasted three years, Genghis Khan and his generals destroyed the Khwarezmian armies and caused the empire to disintegrate. The Khwarezmian Sultan Ala ad-Din Muhammad succumbed to disease on an island in the Caspian Sea, leaving his son, Jalal ad-Din Mingburnu landless.