Ioannes Doukas
- Født: Omkr 1125
- Død: Omkr 1200 i en alder af ca. 75 år
 Notater:
John Doukas, Latinized as Ducas, (Greek: Ioannes Doukas; ca. 1125/1127 - ca. 1200) was the eldest son of Constantine Angelos by Theodora Komnene, the seventh child of the Byzantine Emperor Alexios I Komnenos and Irene Doukaina, from whose family name John Doukas took his own. He served as a military commander under Manuel I Komnenos and his nephew Isaac II Angelos, who raised him to the high rank of sebastokrator. Despite his advanced age, he continued to be an active general in the 1180s and 1190s, and until shortly before his death aspired to the imperial throne. He was the progenitor of the Komnenos Doukas line, which founded the Despotate of Epirus after the Fourth Crusade.
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