Tags: Monarch.
Constantine Doukas or Ducas (Greek: Κωνσταντίνος Δούκας Kōnstantinos Doukas) (c. 1074 – c. 1095) was Byzantine co-emperor from c. 1074 to 1078 and from 1081 to 1087. He was the son of Emperor Michael VII Doukas and his Georgian wife Maria of Alania.Constantine was porphyrogennētos i.e. born in the purple and was associated on the throne by his father soon after his birth.