Kaliman Asen II (Bulgarian: Калиман Асен II), or commonly, but less accurately Koloman Asen II, ruled as tsar of Bulgaria for a short time in 1256. The...

(Bulgarian: Калиман Асен I; 1234-August/September 1246) was Emperor (Tsar) of Bulgaria from 1241 to 1246. He was the son of Ivan Asen II of Bulgaria and...

than the Holy Roman emperor. The fifth ruler of the second empire, Ivan Asen II (1218–1241) after 1230 extended his original title "Emperor of the Bulgarians"...