John Doukas
Member of the Doukas
John Doukas was a member of the Doukas family, a relative of Byzantine emperor Alexios I Komnenos and a senior military figure of his reign. As governor of Dyrrhachium, he secured the imperial possessions in the western Balkans against the Serbs. Wikipedia
Great-grandparents: Ivan Vladislav of Bulgaria, NN, and Andronikos Doukas
Parents: Andronikos Doukas and Maria of Bulgaria