Now, a Grand empress dowager is called with the title of honor 'Heika' (her Majesty) but in ancient times, 'Gu' (palace) was attached after their names as the title of honor.
現在の敬称は「太皇太后陛下」であるが、古くは太皇太后宮という様に「宮」(ぐう)の字をつけて敬称した。