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Wiki information Doukaina:
Irene Doukaina or Ducaena was the wife of the Byzantine emperor Alexios I Komnenos, and the mother of the emperor John II Komnenos and of the historian Anna Komnene.
Euphrosyne Doukaina Kamaterina or better Kamatera was the wife of the Byzantine Emperor Alexios III Angelos. Euphrosyne was the daughter of Andronikos Doukas Kamateros, a high-ranking official who held the titles of megas droungarios and pansebastos....