In the course of his kingdom, the Ruler Iran Shah had followed his relatives strictly. However, Kirman Shah's son had run away from this pursuit and he knew how to hide himself. As a result, he was found and enthroned as the ruler of the Kirman Seljuk State in 1101. Oman people tried to benefit from the bad administration of the state by Iran Shah and the interregnum period in the course of the change of rulers. Probably in the first days of the enthronement of Arslan Shah, a person named as Emir Ebu Sa'd Muhammed had established dominion in half of Oman. However, Arslan Shah recaptured Oman and established his dominion. Some turmoil that burst out in the region of Fars was resolved and the conditions of peace and security were provided. The Ruler Arslan Shah was submissive to Sultan Sencer in the east. Besides this submission, he had established good relations with the Seljuks in Iraq. These good relations were reinforced particularly through marriages. But afterwards, the Ruler Arslan Shah did not have any capacity for work due to the extension of his period of kingdom and his over-age of seventy. As a result, his son, Muhammed set off much before than his brothers. He took his father from the palace and arrested him and then, he ascended the throne of Kirman Seljuks State (August-September 1142). Arslan Shah lived in the castle that he was arrested in for three years and died (probably in 1145).