Amir Chūpān (Persian: امیر چوپان; died November 1327), also spelt Choban or Coban, was a Chupanid noble of the Ilkhanate, and nominal general of the Mongol Empire.
His grandfather was Tudaun from the Suldus clan and was directly descended from Chilaun, who was one of Genghis Khan's four great companions.
Tudaun accompanied Hulagu on his campaign against Golden Horde in 1262 and named as governor of Diyar Bakr, died in 1277 at the Battle of Elbistan.
During Ghazan's fight with Baydu for the throne in 1295, Chupan met with him near the Ustunavand castle and changed sides.
However, later, Chupan's army under the command of Ghazan's chief military officer Qutlugh Shah, was defeated by the Mamelukes in the battle of Marj al-Saffar (1303).
Following his death, Öljeitü made Chupan his chief military commander or Amir of the Ulus (nation).
Chupan was on his way to assist Amir Husain (the father of the founder of the Jalayirids, Hasan Buzurg) against the raids of the Chagatai prince Yasa'ur, who was devastating Khurasan, but then turned around to support Abu Sa'id upon receiving word that the latter's position across the Kur River was in danger.
When the amir enacted punishment against Qurumushi (also a potential rival), as well as several other officers, for their military negligence, a conspiracy was then launched against him.
His sons Timurtash, Shaikh Mahmud, Hasan and Demasq Kaja were given governorships of Anatolia, Georgia, Khorasan and Azerbaijan respectively.
While Abu Sa'id lacked a treasury, Chupan's son and administrative representative Demasq Kaja spent his wealth extravagantly.
By the request of Abu Said, the Khagan Yesün Temür awarded his custodian Chupan the nominal title of a chief-commander of all Mongol Khanates.
[4] In the autumn of that year, the Chagatai Khan Tarmashirin crossed the Oxus River, and was defeated by Chupan's son Hasan near Ghazna.
The vizier Rukn al-Din Sa'in had traveled with Chupan, leaving Demasq Kaja in effective control at the Ilkhanid court.
Using opportunity, on 25 August 1327, Abu Sa'id had one of Chupan's sons, Demasq Kaja, killed, apparently for his activities with a former concubine of Öljaitü's.
he convinced the local religious leader of Simnan, Shaikh 'Ala' al-Daula, to try to negotiate a truce, and then camped near Qazvin.
Upon reaching Quha, he was a day's journey away from Abu Sa'id's camp, but as night fell, most of his army including Muhammad Beg, uncle of Abu Sa'id deserted him near Ray, taking 30.000 soldier with them, leaving Chupan no choice but to retreat to Herat.