The Qasim Khanate was a Tatar-ruled khanate that existed in Ryazan Oblast from 1452 to 1681, with Kasimov serving as its capital. After the creation of the Mongol Golden Horde in the 13th century, Turkic settlers arrived in lands once inhabited by the Volga Finns, accepting Islam under the influence of the Volga Bulgars. In 1393, the area became part of Muscovy, and Vasily II of Moscow made his Muslim ally Qasim Khan ruler of the region after the Battle of Suzdal in 1445. The capital was named Kasimov after the khanate's founder, but the Russians continued to control the khanate's outer politics. The Qasim khans aided the Muscovites against the Kazan Khanate and in the Livonian War, and Russia began to Christianize the khanate during the reign of Sayed Borhan from 1627 to 1679. The Russians suppressed a Tatar revolt in 1656 and, on the death of Fatima Soltan in 1681, the khanate was abolished and incorporated into the Tsardom of Russia.