The Empress, the Grand Empress Dowager, and the Empress Dowager were addressed by the title Her Majesty, and all other Imperial family members were addressed by the title of His or Her Imperial Highness (Articles 17 and 18 of the former Imperial House Act).
皇后・太皇太后・皇太后は陛下、それ以外の皇族は殿下の敬称を称した（旧皇室典範17,18条）。