Konstantinos Doukas
Byzantine co-emperor · Historical Figures · Lived 1074 to 1095 · aged 21
Constantine Doukas or Ducas was Byzantine junior emperor from 1074 to 1078, and again from 1081 to 1087. He was born to Emperor Michael VII Doukas and Empress Maria of Alania in about 1074, and elevated to junior emperor probably in the same year.
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He was junior emperor until 1078, when Michael VII was replaced by Nikephoros III Botaneiates. Because Constantine was not made junior emperor under Nikephoros III, his betrothal to Olympias, the daughter of Robert Guiscard, was broken, which Robert Guiscard used as a pretext to invade the Byzantine Empire. John Doukas forced Nikephoros to abdicate in favor of Alexios I Komnenos in 1081, and shortly afterwards Alexios elevated Constantine to junior emperor. Constantine married Alexios's daughter Anna Komnene, and remained junior emperor until 1087, when Alexios had a son, John II Komnenos. Constantine died in c. 1095.
