藤原道長
Ichijō had two empress consorts. First was Teishi (or Fujiwara no Sadako), a daughter of Fujiwara no Michitaka. Second was Shōshi (or Akiko), a daughter of Fujiwara no Michinaga, a younger brother of Michitaka. Most people thought it impossible to have two empress consorts, but Michinaga claimed that the empress held two separate titles, "Chūgū" and "Kōgō", which were different in principle and could therefore given to two different women.