According to Dai Matsui[1] and Daniel King,[2] his name was of Christian Uyghur origin and ultimately derived from the Sogdian word "ʿywšmbt" (cognate with Persian: دوشنبه, romanized: Dushanbah, lit. 'Monday').

He was born to Hulagu and his concubine Nogachin Aghachi, a lady of Chinese of Khitan origin from camp of Qutui Khatun in Mongolia.

However Ayyubid malik of the city al-Kamil Muhammad resisted Yoshmut for a while, despite reinforcements from Mosul sent by Badr al-Din Lu'lu'.

Despite all, before his death in 1265, Hulagu appointed his sons Abaqa to viceroyalty of Khorasan and Yoshmut to Azerbaijan, Arran, Shirvan and in general march of Derbent.

Hearing news of his father's death, Yoshmut rushed to capital, unsuccessfully campaigning for kurultai but losing hope returning to Derbent after 2 days.

Yoshmut fought with Golden Horde commander Nogai on banks of Aqsu river in Shirvan on 19–20 July 1265 and managed to shoot him in the eye after a fierce battle, forcing him to retreat.