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 Khwarazmian Empire from 1200 to 1220. His ancestor was Anushtegin Gharchai, a Turkic slave soldier who eventually became a viceroy of a small province named Khwarizm. He is perhaps best known for inciting the Mongol conquest of the Khwarazmian Empire, which resulted in the utter destruction of his empire.