The Mongol invasion of Volga Bulgaria lasted from 1223 to 1236. The Bulgar state, centered in lower Volga and Kama, was the center of the fur trade in Eurasia throughout most of its history. Before the Mongol conquest, Russians of Novgorod and Vladimir repeatedly looted and attacked the area, thereby weakening the Bulgar state's economy and military power. The latter ambushed the Mongols in the later 1223 or in 1224. Several clashes occurred between 1229–1234, and the Mongol Empire conquered the Bulgars in 1236.
The Battle of the Kalka River was fought between the Mongol Empire, whose armies were led by Jebe and Subutai, and a coalition of several Rus' principalities, including Kiev and Galicia-Volhynia, and the Cumans under Köten. They were under the joint command of Mstislav the Bold and Mstislav III of Kiev. The battle was fought on May 31, 1223 on the banks of the Kalka River in present-day Donetsk Oblast, Ukraine, and ended in a decisive Mongol victory.
The siege of Trebizond in 1222–1223 was an unsuccessful siege of Trebizond, the capital of the namesake empire, by the Sultanate of Rum under a certain Melik. According to the late 14th-century Synopsis of Saint Eugenios of John Lazaropoulos, the city was close to being captured but was saved by an unusually severe storm. The Seljuq assaults were repulsed, and their army was annihilated on its retreat through the attacks of the Matzoukaites, fierce mountain tribes under Trebizond's rule, and Melik was captured.
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