Hasan Buzurg
During Abu Sa'id's lifetime, Hasan Buzurg was also called upon by Ghiyas al-Din to help stop rampant tax abuses in eastern Iran.[5] However, Arpa's rule was not accepted by a part of Oirats, whose leader and the governor of Baghdad - Ali Padshah was an uncle of Abu Sa'id and had his own designs on throne.Claiming Abu Sa'id's wife Dilshad Khatun was still pregnant, he raised Musa, the grandson of Baydu as rightful heir to the throne.Pir Husayn was crowned in Anatolia on 20 July 1336 with the title "Muhammad Khan" and Hasan left for Iran, leaving his deputy Eretna behind to act as governor.[5] Shortly afterwards, however, several descendants of Chupan united under his grandson Hassan Kuchak, who used a slave called Qara Juri to impersonate his father Timurtash in order to legitimatize his cause.[13] The conflict with the Chobanids again boiled over, and Hasan Buzurg and Jahan Temur met Hassan Kuchak and his new puppet Suleiman Khan in battle on the Jaghatu.In return, al-Malik was promised that his son-in-law Ibrahim Shah Sutayid would be granted Diyar Bakr instead of pro-Jalayirid Hajji Taghay.After he stopped recognizing Togha in 1344, he still did not proclaim himself independent, and ruled with the title of ulus beg, as a mere governor, simply leaving the Ilkhan throne unfilled.Hasan Buzurg continued to play an influential part in Persian politics; he assisted the Injuid Abu Ishaq against the Muzaffarids, helping him restore his rule in Isfahan in 1353.Furthermore, he attempted to unify Persia; he had sent a Muhammad-I Mulai to act as governor of Khurasan, for example; the latter was later executed by Togha Temür's military commander Arghun Shah.In attempting to maintain the Ilkhanate, he ultimately failed, and in some ways accelerated its disintegration, by preventing other forces such as the Chobanids from gaining more influence.