Emperor Seiwa

Emperor Seiwa (850–881), personal name Korehito, was the 56th emperor of Japan, reigning from 858 to 876. The fourth son of Emperor Montoku, he was made crown prince through the influence of his maternal grandfather Fujiwara no Yoshifusa and ascended at nine, leaving Yoshifusa to rule as sesshō, the first Fujiwara regent.

Seiwa abdicated in 876 in favour of his young son Emperor Yōzei, took Buddhist vows in 878, and died in 881. His descendants led the Seiwa Genji warrior line.