Shams al-Din was the leader of the Sarbadars

Sarbadars

The Sarbadars were a mixture of religious dervishes and secular rulers that came to rule over part of western Khurasan in the midst of the disintegration of the Mongol Ilkhanate in the mid-14th century...

 of Sabzewar from 1347 until around 1348.

Reign

Shams al-Din was the son of Fazl Allah and the brother of 'Abd al-Razzaq and Wajih ad-Din Mas'ud

Wajih ad-Din Mas'ud

Wajih ad-Din Mas'ud was the leader of the Sarbadars of Sabzewar from 1338/1339 until his death. Under his rule, the Sarbadar state developed its characteristic dual nature as both a secular and radical Shi'i state.-Early Reign:...

. As such, he had significant support amongst the members of the Bashtini gentry

Gentry

Gentry denotes "well-born and well-bred people" of high social class, especially in the past....

 and the military. In 1347 they moved against Kulu Isfandiyar

Kulu Isfandiyar

Kulū Isfandiyār was the leader of the Sarbadars of Sabzewar from 1346 until around 1347.-Career:Kulu Isfandiyar was a military commander under Wajih ad-Din Mas'ud and was one of his supporters. In 1346 was installed as head of state by Khwaja Shams al-Din 'Ali, the head of the pro-dervish party...

, who at that time controlled Sabzewar, and overthrew him. Shams al-Din then took control of the government. He was only able to hold on to power for about a year. A failure to pay the troops resulted in him in losing the favor of the military, and eventually he had so few supporters that the pro-dervish aristocrat Khwaja Shams al-Din 'Ali

Khwaja Shams al-Din 'Ali

Khwaja Shams al-Din 'Ali was the leader of the Sarbadars of Sabzewar from 1348 until his death.-Biography:Shams al-Din 'Ali was a member of the Sabzewar aristocracy and a leader of one of one of the city guilds. During Shaikh Hasan Juri's lifetime, he had been an adviser to him, and was a...

  was able to stage a coup and force him to abdicate in 1348.