Fujiwara no Teishi

, also known as Sadako, Teishi entered the court in 990 as a but within the same year was promoted to the rank of . She was arranged to marry Emperor Ichijō upon the ceremony of his age of majority. She was given the title of Empress, her father was formally appointed regent to the Emperor, and her sister was later married to the Emperor's cousin and Crown Prince.

Empress consort Empress Teishi hosted a literary and cultural court, and Sei Shōnagon was appointed her lady-in-waiting. In 995, a series of events unfolded which deteriorated her position. Her father died in an epidemic that swept through the capital and was succeeded as regent by his rival, her uncle Fujiwara no Michinaga, and her brothers Korechika and Takaie were involved in a scandal that led to their banishment. The issue concerned the former Emperor Kazan who was involved with the same woman as Korechika.

Because of the competition between her and Shōshi, the second empress, the Kana literature was developed. During Heian Period court culture specifically, women showed the beauty in their ability to write poetry, play instruments, and paint. Teishi's lady in waiting, Sei Shonagon wrote The Pillow Book as a way to gain the Emperor's affection. However, Shōshi's lady in waiting wrote the famous Tale of Genji, which proved to have more impact on Heian society, ultimately promoting her to the rank of Empress as well. The many political rivalries between Teishi and the Emperor would make her delve into a period of depression and exile. Teishi was considered to be devoted to the Emperor as she showed a moral victory over the regent who attempted to divert the Emperor's affections to Shōshi.

Empress Teishi died on the 15th day of the 12th month after giving birth to her daughter Bishi. Her son, Atsuyasu, was adopted by Shōshi in 1004. Atsuyasu was a favourite of his father Emperor Ichijō, but the emperor was unable to declare him as the crown prince due to his lack of familial backing once Shōshi's son was born in 1008. The diary of court calligrapher Fujiwara no Yukinari records that even within a month of the nomination of his son Atsuhira (later Emperor Go-Ichijō), Emperor Ichijō was still considering nominating Atsuyasu for the throne.

Legacy Her legacy of inspiring The Pillow Book is still maintained today in Japanese society. Because of her depression and social demise, she is remembered as an emotionally charged empress who was able to subdue minimal power from the regency.

Issue Imperial Princess Shushi (脩子内親王) (997–1049) Imperial Prince Atsuyasu (敦康親王) (999–1019) Imperial Princess Bishi (媄子内親王) (1001–1008)