Constantine I Tih

Constantine Tih Asen was a wealthy Bulgarian boyar with estates around Skopje. Elected tsar at Tarnovo in 1257 on the Asen dynasty's extinction, he married Irene Laskarina, daughter of the Nicaean emperor, and took the name Asen.

He fought Hungary for Vidin and seized Philippopolis in 1262, only to lose it to Michael VIII Palaiologos. Paralyzed in a riding accident, he left government to his wife. In 1277 the swineherd Ivaylo rebelled; Constantine marched against him and was killed in his chariot.