 He returned to Patan and forced his grandfather Muzaffar Shah to drink poison which killed him.Ahmad Shah succeeded him with the title of Nasir-ud-dunya Wad-din Abul fateh Ahmad Shah at the age of 19 in 1411.Soon after assuming power, his cousin Moid-ud-din Firuz Khan, governor of Vadodara, allying himself with Hisam or Nizam-ul-Mulk Bhandari and other nobles, collected an army at Nadiad, and, laying claim to the crown, defeated the king's followers.