Jahan Temür was a Jalayirid

Jalayirids

The Jalayirids were a Mongol Jalayir dynasty which ruled over Iraq and western Persia after the breakup of the Mongol Khanate of Persia in the 1330s....

 candidate for the throne of the Ilkhanate

Ilkhanate

The Ilkhanate, also spelled Il-khanate , was a Mongol khanate established in Azerbaijan and Persia in the 13th century, considered a part of the Mongol Empire...

 in the late 1330s. He was the son of Ala-Fireng and the grandson of the Ilkhan Gaykhatu

Gaykhatu

Gaykhatu was the fifth Ilkhanate ruler in Iran. He reigned from 1291 to 1295. During his reign, Gaykhatu was a noted dissolute who was addicted to wine, women, and sodomy...

.

Having repudiated the titular sovereignty of the Ilkhan claimant Togha Temur

Togha Temür

Togha Temür , also known as Taghaytimur, was a claimant to the throne of the Ilkhanate in the mid-14th century. Of the many individuals who attempted to become Ilkhan after the death of Abu Sa'id, Togha Temür was the only one who hailed from eastern Iran, and was the last major candidate who was of...

 early in the summer of 1339, the Jalayirid Hasan Buzurg

Hasan Buzurg

Shaikh Hasan, called "Buzurg" , was the first of several de facto independent Jalayirid rulers of Iraq and central Iran. He was the son of Husain and Öljetey.-Shaikh Hasan-i Buzurg:...

 raised Jahan Temür to the throne. In June 1340 Hasan Buzurg and his puppet khan met the Chobanids under Hasan Kucek in battle on the Jaghatu; the Jalayirids were defeated. Following this, Hasan Buzurg returned to Baghdad

Baghdad

Baghdad is the capital of Iraq, as well as the coterminous Baghdad Governorate. The population of Baghdad in 2011 is approximately 7,216,040...

and deposed Jahan Temür. While Hasan Buzurg would recognize Togha Temur as his suzerain again for a time, Jahan Temür was his last puppet Ilkhan, and the Jalayirid (Ilkan) dynasty of Baghdad came to rule in its own right. The fate of Jahan Temür himself is not recorded.