藤原定家
He was a close friend of Fujiwara no Teika and his daughter married Teika's son Tameie. He is also said to have commissioned Teika's compilation of the "Ogura Hyakunin Isshu". The collection was originally prepared (in a slightly different form to the present "Ogura Hyakunin Isshu") to in Yoritsuna's Mt. Ogura residence in the Saga district of Kyoto.