During much of the domination of the Slavic city-states by the Mongols, the pre-eminent power was the Golden Horde, which adopted sedentary features, including a traditional capital city and palaces in Sarai.
The Golden Horde, self-designated as Ulug Ulus (lit. ‘Great State’ in Turkic), was originally a Mongol and later Turkicized khanate established in the 13th century and originating as the northwestern sector of the Mongol Empire. With the division of the Mongol Empire after 1259, it became a functionally separate khanate.
During much of the domination of the Slavic city-states by the Mongols, the pre-eminent power was the Golden Horde, which adopted sedentary features, including a traditional capital city and palaces in Sarai.
https://en.wikipedia.org/wiki/Golden_Horde
seems like i’ve got some reading to do