Alā ud-Dīn Atsiz (died 1156), Khwarazm Shah from 1127 until his death Ala ad-Din Tekish, (died 1200), Khwarazm Shah from 1172 Ala ad-Din Muhammad II of Khwarezm (died 1221), Khwarazm Shah from 1200 Ala ud din Masud, Sultan of Delhi from 1242 to 1246 Alaeddin Keykubad (disambiguation), three Seljuk sultans in Anatolia Kayqubad I, 'Alā al-Dīn Kayqubād bin Kaykā'ūs (died 1237) Kayqubad II, 'Alā al-Dīn Kayqubād bin Kaykhusraw (died 1256) Kayqubad III, 'Alā al-Dīn Kayqubād bin Ferāmurz (died 1302) Alauddin Khilji (died 1316), a sultan and military leader in India Alaeddin Pasha (died 1331 or 1332), son of Osman I and brother of Orhan I, first Grand Vizier of the Ottoman Empire Alauddin Ali Shah (died 1342), a ruler in Bengal Ala'a ad-Din Kujuk, (1334-1345), Mamluk Sultan of Egypt from 1341 to 1342 Ala-ud-Din Bahman Shah (died 1358), founder of the Bahmani Sultanate on the Indian subcontinent Alauddin Riayat Shah of Malacca (died 1488), Sultan of Malacca Alauddin Husain Shah (died 1519), Sultan of Bengal Alauddin Riayat Shah II of Johor (died 1564), founder of the Sultanate of Johor, grandson of Alauddin Riayat Shah of Malacca Alauddin al-Kahar (died 1571), Sultan of Aceh Alauddin Alam Shah, regnal name of Tengku Alam Shah (1846-1891), the last Malay sultan of Singapore