 Köten was deposed from power in that year, but he remained leader of the Terteroba clan.In the early spring of 1237, the Mongols attacked the Cuman-Kipchaks.Some of the Cuman-Kipchaks surrendered; it was this element that was later to form the ethnic and geographic basis of the Mongol khanate known to the former lords of the country as the "Kipchak khanate".