Fujiwara no Taishi (藤原 帯子, also read Fujiwara no Tarashiko; died 794) was a Japanese noblewoman of the Nara period. She was a consort of Prince Ate. She had no children with him, but more than a decade after her death she was granted the title of empress on her husband's becoming Emperor Heizei.
Fujiwara no Taishi's year of birth is unknown. [1] Her father was Fujiwara no Momokawa. [1] At some point she married Prince Ate (773–824), [1] but died suddenly of an illness in Enryaku 13 (794). [1] She was posthumously granted the title of empress (kōgō) upon the accession of her husband to the throne in Daidō 1 (806). [1] It is thought that the reason she was granted this title over, for example, Ise no Tsugiko [1] (mother of Prince Takaoka , etc. [1]) or Fujii no Tōshi [1] (mother of Prince Abo [1]), despite having already died without issue, [1] was due to the influence of her elder brother, Minister of the Left Otsugu. [1]