Boril of Bulgaria

Boril was tsar of Bulgaria from 1207 to 1218. A nephew of Kaloyan through a sister of the three Asen brothers, he seized the throne after Kaloyan died besieging Thessaloniki in October 1207 and married his Cuman widow. His cousin Ivan Asen fled abroad while other kinsmen rebelled.

In July 1208 the Latin emperor Henry defeated him near Philippopolis. In early 1211 Boril held a church council at Tarnovo that condemned the Bogomils, and with Hungarian aid crushed a revolt at Vidin. In 1218 Ivan Asen returned, captured him at Tarnovo and blinded him.