John Doukas or Ducas (Greek: Ιωάννης Δούκας, Iōannēs Doukas), (c. 1126 – c. 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.
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“The person who designed a robot that could act and think as well as your four-year-old would deserve a Nobel Prize. But there is no public recognition for bringing up several truly human beings.”
—C. John Sommerville (20th century)