Emperor Seiwa
The most prominent of the several Minamoto families, the Seiwa Genji, descended from Minamoto no Tsunemoto (897–961), a grandson of Emperor Seiwa. Tsunemoto went to the provinces and became the founder of a major warrior dynasty. Minamoto no Mitsunaka (912–997) formed an alliance with the Fujiwara. Thereafter the Fujiwara frequently called upon the Minamoto to restore order in the capital, Heian-Kyō (modern Kyōto).