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Seiwa succeeded his father [[Emperor Montoku]] as emperor. His grandfather [[Fujiwara no Yoshifusa]] served as regent (''sesshô'') for a time.<ref>Evelyn Rawski, ''Early Modern China and Northeast Asia: Cross-Border Perspectives'', Cambridge University Press (2015), 155.</ref>

Seiwa succeeded his father [[Emperor Montoku]] as emperor. His grandfather [[Fujiwara no Yoshifusa]] served as regent (''sesshô'') for a time.<ref>Evelyn Rawski, ''Early Modern China and Northeast Asia: Cross-Border Perspectives'', Cambridge University Press (2015), 155.</ref>

Seiwa was a devout Buddhist, and granted the title of ''Hôin Yamato jôi'' ("Yamato Upper Rank Seal of the Law") to [[Kukai|Kûkai]].<ref>Ono Masako, Tomita Chinatsu, Kanna Keiko, Taguchi Kei, "Shiryô shôkai Kishi Akimasa bunko Satsuyû kikô," ''Shiryôhenshûshitsu kiyô'' 31 (2006), 252.</ref>

Seiwa was a devout Buddhist, and granted the title of ''Hôin Yamato jôi'' ("Yamato Upper Rank Seal of the Law") to [[Kukai|Kûkai]].<ref>Ono Masako, Tomita Chinatsu, Kanna Keiko, Taguchi Megumi, "Shiryô shôkai Kishi Akimasa bunko Satsuyû kikô," ''Shiryôhenshûshitsu kiyô'' 31 (2006), 252.</ref>

Seiwa had six sons who bore the surname Minamoto - a name granted as an honor by the Imperial court. The Seiwa Genji - including first [[Kamakura shogunate|Kamakura shogun]] [[Minamoto no Yoritomo]] and his brother, the famous [[Minamoto no Yoshitsune]] - claimed descent from Seiwa's sixth son, [[Minamoto no Sadazumi]], through Sadazumi's son [[Minamoto no Tsunemoto]].

Seiwa had six sons who bore the surname Minamoto - a name granted as an honor by the Imperial court. The Seiwa Genji - including first [[Kamakura shogunate|Kamakura shogun]] [[Minamoto no Yoritomo]] and his brother, the famous [[Minamoto no Yoshitsune]] - claimed descent from Seiwa's sixth son, [[Minamoto no Sadazumi]], through Sadazumi's son [[Minamoto no Tsunemoto]].