However, concerning the prerequisite for the post of Shikibu-Kyo, Yoshimoto NIJO mentioned in "Hyakuryo Kunyosho" (court and samurai rules of ceremony and etiquette) that was compiled in the period of the Northern and Southern Courts (Japan): 'The most excellent Imperial Prince should assume the post of Shikibu-Kyo.'
ただし、南北朝時代(日本)に二条良基が『百寮訓要抄』の中で式部卿の就任要件として「第一の親王是に任ず」と説いた。