Kaliman Asen II of Bulgaria

Kaliman Asen II ruled as tsar of Bulgaria for a few months in 1256. The son of Alexander, younger brother of Ivan Asen II, he murdered his cousin Tsar Michael II Asen at a hunting party near Tarnovo, seized the throne and married the dead tsar's widow.

Her father Rostislav then marched on Tarnovo and forced him to flee. Mitso Asen took the throne, and Kaliman was murdered after his supporters deserted him.