Porphyrogennitos

Porphyrogenitos or Porphyrogenetos (Greek: Πορφυρογεννητος). Title used by descendants of the Emperors family, born in the "Purple Room" of the Imperial Palace in Constantinople, to claim status or legitimacy to the Throne.

The "purple room" was a special, women's only room, for the women of the Emperors family and their women friends to meet and talk in the absence of man. The room, which was decorated in the purple, was also used as a "delivery room".

Quote from "The Alexiad": The "purple" was a room in the Palace set aside for the confinement of the ruling Empress. Thus the children born there were called "porphyrogeniti".