Jalal ad-Din Mingburnu (
Persian: جلال الدین خوارزمشاه;
full name:
Jalal ad-Dunya wa ad-Din Abul-Muzaffar Manguberdi ibn Muhammad) or
Manguberdi (
Turkic for "Godgiven"), also known as
Jalâl ad-Dîn Khwârazmshâh, was the last ruler of the
Khwarezmian Empire. Following the defeat of his father,
Ala ad-Din Muhammad II by
Genghis Khan in 1220, Jalal ad-Din Mengübirti came to power but he rejected the title
shah that his father had assumed and called himself simply
sultan. Jalal ad-Din retreated with the remaining Khwarazm forces, while pursued by a Mongol army and at the
battle of Parwan, north of
Kabul, defeated the Mongols.