Born in the purple
title granted to Byzantine (and later other) princes
Traditionally, born in the purple (sometimes "born to the purple") was a category of members of royal families born during the reign of their parent. This notion was later loosely expanded to include all children born of prominent or high-ranking parents. The parents must be prominent at the time of the child's birth so that the child is always in the spotlight and destined for a prominent role in life. A child born before their parents became prominent would not be "born in the purple". This color purple came to refer to Tyrian purple, restricted by law, custom, and the expense of creating it to royalty.
Porphyrogénnētos (Greek: Πορφυρογέννητος, lit. 'purple-born'), Latinized as Porphyrogenitus, was an honorific title in the Byzantine Empire given to a son, or daughter (Πορφυρογέννητη, Porphyrogénnētē, Latinized Porphyrogenita), born after the father had become emperor.
Both imperial or Tyrian purple, a dye for cloth, and the purple stone porphyry were rare and expensive, and at times reserved for imperial use only. In particular there was a room in the imperial Great Palace of Constantinople entirely lined with porphyry, where reigning empresses gave birth.
Porphyrogeniture
Porphyrogeniture is a system of political succession that favours the rights of sons born after their father has become king or emperor, over older siblings born before their father's ascent to the throne.
Examples of this practice include Byzantium and the Western European model.
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