Emperor Yōzei

Emperor Yōzei (869–949) was the 57th emperor of Japan, reigning from 876 to 884. The eldest son of Emperor Seiwa, he was named crown prince in infancy and ascended at nine, with his uncle Fujiwara no Mototsune as regent.

In 883 a courtier was beaten to death in the palace amid rumours of his involvement, and in 884 Mototsune deposed him, presenting the abdication as voluntary on grounds of illness. Yōzei then lived sixty-five years as a retired emperor, the longest such retirement, and was known as a waka poet.