Emperor Seiwa
was the founder and first "shōgun" of the Ashikaga shogunate. His rule began in 1338, beginning the Muromachi period of Japan, and ended with his death in 1358. He was a male-line descendant of the samurai of the (Minamoto) Seiwa Genji line (meaning they were descendants of Emperor Seiwa) who had settled in the Ashikaga area of Shimotsuke Province, in present-day Tochigi Prefecture.