By the way it was indeed the first time for the Imperial Princess to be officially appointed as Chugu in four hundred and sixty years, since Emperor Godaigo's Chugu, Imperial Princess Junshi (Emperor Gofushimi's first Princess, Shinmuromachiin)
ちなみに、内親王の中宮立后は後醍醐天皇の中宮珣子内親王（後伏見天皇の第一皇女、新室町院）以来実に460年ぶりのことであった。