John I Doukas (Greek: Ἰωάννης Δούκας, Iōannēs Doúkas), Latinized as Ducas, was an illegitimate son of Michael II Komnenos Doukas, Despot of Epirus in c. 1230–1268. After his father's death, he became ruler of Thessaly from c. 1268 to his own death in 1289. From his father's family he is also inaccurately known as John Angelos.

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  • John I Doukas (Greek: Ἰωάννης Δούκας, Iōannēs Doúkas), Latinized as Ducas, was an illegitimate son of Michael II Komnenos Doukas, Despot of Epirus in c. 1230–1268. After his father's death, he became ruler of Thessaly from c. 1268 to his own death in 1289. From his father's family he is also inaccurately known as John Angelos. Married to a Thessalian Vlach woman, John first appears leading Vlach troops alongside his father in the lead-up to the Battle of Pelagonia in 1259. His defection to the camp of Emperor Michael VIII Palaiologos was crucial in the battle, which ended with the crushing defeat of the Epirotes' Latin allies and opened the way for the recovery of Constantinople and the re-establishment of the Byzantine Empire under Palaiologos in 1261. John quickly returned to the side of his father and brother, Nikephoros, and assisted them in recovering Epirus and Thessaly. After Michael II died, John became ruler of Thessaly with his seat at Neopatras, whence Western chroniclers often erroneously called him "Duke of Neopatras". Although Michael VIII Palaiologos engaged him in a marriage alliance and awarded him with the high title of sebastokratōr, John remained the foremost of Palaiologos' Greek opponents throughout the latter's reign. A staunch opponent of the Union of the Churches promoted by Palaiologos for political reasons, he provided refuge to several political opponents of the emperor, and even convoked synods that anathematized Palaiologos and the supporters of the Union. He resisted several attempts by Byzantine armies to conquer Thessaly, and allied himself with Palaiologos' Latin enemies, including the Duchy of Athens and Charles of Anjou. He died in 1289, leaving the rule of Thessaly to his sons, Constantine and Theodore. (en)
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  • John I Doukas (Greek: Ἰωάννης Δούκας, Iōannēs Doúkas), Latinized as Ducas, was an illegitimate son of Michael II Komnenos Doukas, Despot of Epirus in c. 1230–1268. After his father's death, he became ruler of Thessaly from c. 1268 to his own death in 1289. From his father's family he is also inaccurately known as John Angelos. (en)
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  • John I Doukas of Thessaly (en)
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  • male (en)
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