1229–1230: Second Mongol invasion of Volga Bulgaria.
1236: Third Mongol invasion of Volga Bulgaria; Volga Bulgaria and parts of were conquered.
Cumania
Destruction under the Mongol Empire
Genghis Khan
The Course of Russian History, Vol. 2.
1229–1230: Second Mongol invasion of Volga Bulgaria.
1236: Third Mongol invasion of Volga Bulgaria; Volga Bulgaria and parts of were conquered.
The Course of Russian History, Vol. 2.