Ivan Asen II of Bulgaria
Michael II Asen (; 1239 – December 1256/January 1257), was Emperor (Tsar) of Bulgaria from 1246 to 1256 or 1257. He was the son of Ivan Asen II of Bulgaria and Irene Komnene Doukaina. He succeeded his half-brother, Kaliman I Asen. His mother or other relative must have ruled Bulgaria during his minority.