Sanjar's as well as Seljuks' rule collapsed as a consequence of yet another unexpected defeat, this time at the hands of the Seljuks’ own tribe, in 1153. Sanjar was captured during the battle and held in captivity until 1156. It brought chaos to the Empire - situation later exploited by the victorious Turkmens, whose hordes would overrun Khorasan unopposed, wreaking colossal damage on the province and prestige of Sanjar. Sanjar eventually escaped from captivity in the fall of 1156, but soon died in Merv (present-day Turkmenistan), in 1157. After his death, Turkic rulers, Turkmen tribal forces, and other secondary powers competed for Khorasan, and after a long period of confrontations, the province was finally conquered by Khwarazmians in the early 1200s.