He was nominated to the throne by
Abu Sa'id's vizier
Ghiyas al-Din and was elected 5 days later with a regnal title '''Sultan Muiz al-Dunya wa'l Din Mahmud''' on
Karabakh. Almost immediately he had to deal with an invasion by
Özbeg of the
Golden Horde. He defeated the invasion, and furthermore used it as a pretext for executing Abu Sa'id's widow
Baghdad Khatun, accusing her of poisoning Abu Sa'id and allying with Özbeg. Another execution was that of Mahmudshah Inju, former ruler of
Fars province in March 1336 (he was imprisoned by Abu Sa'id earlier because of his attempt on the Ilkhan's life). He also gave
Shaykh Hasan the overall command of armies. He was characterized as not practising Islam and more in favour of
Genghis Khan's
Yasa, mostly ignoring laws of the Muslim khans like
Ghazan and Abu Sa'id. After securing Shaykh Hasan's neutrality, Ali Padshah went on to fight Arpa on
Jaghatu plains near
Maraga culminating in the
Battle of Jaghatu on 29 April 1336. Arpa's army was led by 60 umara, notably Hajji Taghay (son of
Sutay, Governor of
Diyarbakir), Uyghur commander Ögrünch, Torut (a son of Nari and relative of Narin Taghay), Ortuq-Shah (son of Alghu) and
Chupan's son Sorgan Sira. However, soon some emirs defected to the side of Ali Padshah, such as Mahmud b. Essen Qutlugh and Sultanshah Nikruz. The battle was a defeat for Arpa and soon after he was captured in
Sultaniya and killed on 15 May 1336 by Mahmudshah's son, Amir Jalal al-Din Mas'ud Shah. == Ancestry ==