Emperor Seiwa
These were descendants of Emperor Seiwa. The most numerous of them were those descended from Tsunemoto, son of Prince Sadazumi. Hachimantarō Yoshiie of the Kawachi Genji was a leader of a "buke". His descendants set up the Kamakura shogunate, making his a prestigious pedigree claimed by many "buke", particularly for the direct descendants in the Ashikaga clan (that set up the Ashikaga shogunate) and the rival Nitta clan. Centuries later, Tokugawa Ieyasu would claim descent from the Seiwa Genji by way of the Nitta clan.