ruled as emperor («u»tsar «/u») of Bulgaria for a short time in «u»1256
«/u»In «u»1256 «/u» Kaliman Asen murdered his first cousin «u»Michael Asen I «/u» during a hunting party in the environs of the capital «u»Tarnovo «/u»Michael Asen I of Bulgaria and usurped the throne. In the process he married Michael Asen I's widow, the unnamed daughter of «u»Rostislav Mihailovich <http://en.wikipedia.org/wiki/Rostislav_Mihailovich>«/u», but he was unable to maintain himself on the throne