Hvem giftet seg med 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 Emperor Constantine X Doukas. John Doukas was the paternal grandfather of Irene Doukaina, wife of Emperor Alexios I Komnenos.

He was the original owner of Codex Parisinus graecus 2009, i.e. the oldest known and preserved manuscript of De Administrando Imperio written by Emperor Constantine VII Porphyrogenitus, and copied by one of Doukas' scribes, a well-known encyclopedic Byzantine source on foreign nations from the 10th century.