The Mervian dynasty, founded in 1144 at Merv, was the first - and most substantial - kingdom to break away from the Seljuk Sultanate. Their founding ruler Alp Tegin of Merv, earned the title Sultan of Merv after a successful war against the reigning Seljuk Sultan, Qiliq Arslan II in 1150. The dynasty was finally extinguished and absorbed into the territory of the Khwarezm Shahdom in 1200.