The siege of Kazan or Fall of Kazan in 1552 was the final battle of the Russo-Kazan Wars and led to the fall of the Khanate of Kazan. Conflict continued after the fall of Kazan, however, as rebel governments formed in Çalım and Mişätamaq, and a new khan was invited from the Nogais. This guerrilla war lingered until 1556.