Imperial Prince Sadasumi

Imperial Prince Sadasumi (873–916), also called Prince Momozono, was the sixth son of Emperor Seiwa. Invested as prince in 873, he held senior posts under Emperor Uda, as titular governor of Kazusa and Kōzuke and head of two ministries, his rank never passing the fourth grade.

He died in 916. His son Minamoto no Tsunemoto founded the Seiwa Genji, from whom the Kamakura, Ashikaga and Tokugawa houses claimed descent.