The founder of what Shabankareyi calls 'the line of the old kings of Hormoz' was Muhammad Deramku(h/b?), supposedly hailing from Oman, who arrived in Hormoz region, called Mughistan, at the end of the 11th or early 12th century. The origins of Deramku is obscure, although Shabankareyi tells us that the Deramku dynasty in fact had local origins. Muhammad's move to Hormoz from Oman might have in fact been caused by the collapse of Buyid power in the south of Iran and the Persian Gulf and Sea of Oman region following the death of al-Malik al-Rahim in 1059. The Omani origin might simply be based on the later origin of Mahmud Qalahati who similarly hailed from the Oman region. Local histories, including Natanzi, mention that Muhammad Deramku’s connections were most closely with the Kerman region. In fact, the timing would make sense , as the rise of Dearmkū in Hormoz seems to parallel the rise of the local Seljuq Dynasty of Kerman, founded by Malikshah’s brother, Qavurd.