Kotaifujin (title for previous retired emperors consort) (皇太夫人)

Kotaifujin (also called Sumemioya) means a person who was the biological mother of an Emperor and consort of the previous Emperor. This title was given to distinguish Kotaifujin from Kotaigo 'Emperor's mother and dowager' and Kotaihi 'Emperor's mother and wife of Imperial member' before Emperor Daigo.