Yasa'ur

Yasa'ur (died 1320) was a

Abu Sa'id. He was the son of Chübei, and a great-great-grandson of Chagatai Khan

Yasa'ur had originally resided within the

Öljeitü then set off with an army for the east, while the Chagataiid forces were recalled by the khan Esen Buqa

Around this time Yasa'ur, who had been accused by Kebek of cooperated with the Ilkhanid forces during the invasion, defected to Öljeitü. His forces engaged in battle with the Chagataiid troops; an Ilkhanid army that had crossed the

Badghis

.

Öljeitü died in 1316 and was succeeded as Ilkhan by his son Abu Sa'id. Yasa'ur initially pledged loyalty to the new Ilkhan, but was apparently uncooperative with Ilkhanid authorities. In early 1319 he openly revolted against Abu Sa'id, invading the province of

Coban

, overestimating the strength of Yasa'ur, also planned to march against the Chagataiid prince at the head of a 20,000-strong army, but eventually decided to defend against Uzbeg's forces.

Amir Husain's approach caused Yasa'ur to retreat from Mazandaran. From

Kartid Giyath al-Din, had declared his loyalty to the Ilkhanids. The siege of Herat was unsuccessful, however, as Yasa'ur decided to withdraw upon hearing of the approach of the Ilkhanid army and withdrew into southern Afghanistan

. In the following year, he was killed by Kebek, who had recently become Chagatai Khan and who deemed Yasa'ur to still be a threat.

Yasa'ur's personal troops eventually formed the basis of the Yasa'uri, a group that gained influence within the Chagatai ulus in the mid-fourteenth century.

References

J. A. Boyle (1968). The Cambridge History of Iran, Volume Five: The Saljuq and Mongol Periods.
ISBN 0-521-06936-X