Mstislav III of Kiev

Mstislav Romanovich the Old (Ukrainian: Мстислав Романович Старий; Russian: Мстислав Романович Старый) (died 1223) was Prince of Pskov (1179–?), Smolensk (1197–?), Belgorod (1206), Halych (?–?) and Grand Prince of Kiev (1212–1223). He was the son of Roman Rostislavich.

Mstislav defeated an invading Hungarian army in 1221. He went to war against the Mongols of Genghis Khan in 1223 and was defeated at the Battle of the Kalka River by the Mongol generals, Jebe and Subutai, after which he was executed by suffocation (put under a giant wooden plate onto which Subutai, Jebe and other Mongol warlords danced and feasted).

...
Wikipedia