三条右大臣さんじょうのうだいじん

The Minister of the Right of Sanjō belonged to the Northern House of the Fujiwara and was a son of Fujiwara no Takafuji. His real name was Fujiwara no Sadakata. His elder or younger sister with the same mother, Taneko, was a consort of Emperor Uda. Sadakata is thought to have risen as high as Minister of the Right because he was a relative of Emperor Daigo through Daigo's mother.

Sadakata's fifth son, Middle Counselor Asatada, also has a poem in the Hyakunin Isshu. A famous story says that he was a big eater: the doctor told him to eat rice with hot or cold water poured over it, but he ate so much of it that it did no good.

However, in the Konjaku Monogatarishū of the late Heian period, the hero of this story was originally Fujiwara no Asahira, Sadakata's sixth son. The author of Hyakunin Isshu Yūwa, written in the late Edo period, seems to have mixed up the two men and told it as a story about the poet Middle Counselor Asatada.

Sadakata's great-grandchildren include Minamoto no Tomoko, Fujiwara no Michinaga's wife, and Fujiwara no Nobutaka, Murasaki Shikibu's husband.

He and Fujiwara no Kanesuke (Murasaki Shikibu's great-grandfather) were cousins. Both served Emperors Uda and Daigo and helped make the poetry world of the court flourish.