The years of the reign of Yōmei start in 585 and end in 587.[3] The names and sequence of the early emperors were not confirmed as "traditional" until the reign of Emperor Kammu, who was the 50th monarch of the Yamato dynasty.[4]
586: In the 14th year of Bidatsu's reign, the emperor died. The succession (senso) received by Bidatsu's younger brother who would become Emperor Yōmei.[9] This was confirmed in ceremonies.[10]
587, in the 4th month: Yōmei died and his body was placed in a coffin, but not buried.[7] His reign lasted only two years. He died at the age of 69.[11]
587, in the 5th month: There was armed conflict over the succession; and forces led by Prince Shōtoku and Soga no Umako overcame the opposition. The throne passed to a younger brother who would become known as Emperor Shushun.[12]
