Massacres of resident Muskovite merchants were a recurrent feature of this polity's history, by which it eventually harmed itself when the rival (*) Makariev Fair was founded to provide a more secure commercial environment than the one in its central city.
An important history of this polity was supposedly written by John the Big-Eyed. The Battle of the Kamenka River was a resounding victory for this nation, at which it captured and ransomed Vasily II of Moscow. This polity was founded by Olugh Muhammad after his intervention in the succession of Vytautas the Great ended in disaster. Massacres of resident Muskovite merchants were a recurrent feature of this polity's history, by which it eventually harmed itself when the rival (*) Makariev Fair was founded to provide a more secure commercial environment than the one in its central city. This successor state to the Golden Horde ended in 1552, when a resurgent Moscow secured the neutrality of this polity's former allies and co-religionists prior to an invasion. For 10 points, name this Tatar khanate centered on the Volga which was conquered in an early victory for Ivan the Terrible.
An important history of this polity was supposedly written by John the Big-Eyed.
Khanate of Kazan