Yeremferden also known as Jabbar Berdi, was a khan

Khan (title)

Khan is an originally Altaic and subsequently Central Asian title for a sovereign or military ruler, widely used by medieval nomadic Turko-Mongol tribes living to the north of China. 'Khan' is also seen as a title in the Xianbei confederation for their chief between 283 and 289...

 of the Golden Horde

Golden Horde

The Golden Horde was a Mongol and later Turkicized khanate that formed the north-western sector of the Mongol Empire...

 from 1417 to 1419. He was one of the sons of Tokhtamysh

Tokhtamysh

Tokhtamysh was the prominent khan of the White Horde, who briefly unified the White Horde and Blue Horde subdivisions of the Golden Horde into a single state. He was a descendant of Genghis Khan's eldest grandson, Orda Khan or his brother Tuqa-Timur...

 who struggled for power after their father's death. His reign was marked by relative peace save for occasional struggles with Vytautas against Edigu

Edigu

Edigu was a Mongol emir of the White Horde who founded the new political entity, which came to be known as the Nogai Horde....

 and what would become the Nogai Horde

Nogai Horde

The Nogai Horde was a confederation of about eighteen Turkic and Mongol tribes that occupied the Pontic-Caspian steppe from about 1500 until they were pushed west by the Kalmyks and south by the Russians in the 17th century. The Mongol tribe called the Manghits constituted a core of the Horde...

. Following his death, control over the Horde was split between Dawlat Berdi

Dawlat Berdi

Dawlat Berdi , also known as Devlet Berdi, was a Khan of the Golden Horde who reigned from 1419 to 1421, and again from 1428 to his death in 1432. He was the son of Jabbar Berdi and a descendant of Berke Khan....

, his son, and Olugh Mokhammad, his nephew.