Ala ad-Din Muhammad II (Persian: علاءالدین محمد خوارزمشاه; full name: Ala ad-Dunya wa ad-Din Abul-Fath Muhammad Sanjar ibn Tekish) was the Shah of the Khwarezmian Empire from 1200 to 1220. His ancestor was a Turkic slave who eventually became a viceroy of a small province named Khwarizm. He is perhaps best known for inciting the Mongol invasion of Khwarezmia, which resulted in the complete and utter destruction of his empire.