In the course of the turmoils resulting from the death of the Ruler Tugrul Shah, his third son, Behram Shah ascended the throne of Kirman Seljuks State through the support of his Tutor, Reyhan. This situation caused to the opening of the period of interregnum in the Kirman Seljuks State. The struggle that occurred among Tugrul Shah's sons was a significant factor that played an important role in the collapse of the Kirman Seljuks State. The administration of the state was dominated by the tutors. The emirs who wanted to become a prince's tutor struggled among each other. In the course of the struggles for the throne, the brigades of the rulers continuously changed sides between one ruler and the other and provoked the struggles to an extreme degree. Furthermore, the cities that had commercial importance were despoiled and the economical situation of Kirman got worsened gradually. In this period of turmoils, Oguz people who came from Khorasan to Kirman benefited from the weak and unstable administration of the Kirman Seljuks State and established dominion in this region.
Dinar, one of Oguz beys started to establish dominion in the most important cities of Kirman bit by bit. The emirs and statesmen of the Kirman Seljuks State had perceived the danger that was approaching and they got afraid. Then, they started to leave Kirman as soon as possible. The Ruler Dinar captured the capital city of Berdesir in September 1187 and abolished the Kirman Seljuks State thereof.