porphyrogenitism

/P AO0 R F ER0 OW0 JH EH1 N IH0 T IH0 Z AH0 M/
noun
  1. 1

    (rare) The principle of succession in royal families, especially among the Eastern Roman emperors, by which a younger son, if born after the accession of his father to the throne, was preferred to an elder son who was born prior to it.

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