Constantine I Tih Asen was the tsar of Bulgaria from 1257 to 1277, he was offered the throne from Mitso Asen. He led the Bulgarian Empire at a time when the nearby Byzantine Empire disintegrated into rump states. To strengthen his position, he forged an alliance with one of the rump states—Nicaea—by marrying Irene, a daughter of Theodore II of the prominent Laskaris family.
- Occupation
- sovereign
- Position held
- King of Bulgaria
- Citizenship
- Second Bulgarian Empire
- Born
- 1300
- Died
- 1277
