Conomor ( ), also known as
Conomerus or
Conomor the Cursed, was an early medieval ruler of
Brittany. His name, which has the
Welsh cognate Cynfawr, means "Great Dog", but could also indicate "Sea Dog" in early
Brythonic. Conomor was notorious for his cruelty, becoming a legendary villain in
Breton culture. He is widely regarded as one of the probable sources for the myth of
Bluebeard and possibly also of
Tristan's uncle
King Mark of
Cornwall. The wife-beating giant
Cormoran may also retain a garbled folk memory of the same character.