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John Doukas (Caesar)

John Doukas (or Ducas) (Greek: Ιωάννης Δούκας, Iōannēs Doukas) (died c. 1088) was the son of Andronikos Doukas, a Paphlagonian nobleman who may have served as governor of the theme of Bulgaria (Moesia), and the older brother of EmperorConstantine X Doukas.

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