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John Doukas
Usurper of the East Roman (Byzantine) empire
Years: 1025 - 1088
John Doukas (or Ducas) (died c. 1088) is the son of Andronikos Doukas, a Paphlagonian nobleman who may have served as governor of the theme of Moesia and younger brother of Emperor Constantine X Doukas.
John Doukas is the paternal grandfather of Irene Doukaina, wife of Emperor Alexios I Komnenos.
