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Emperor Yūryaku (雄略天皇, Yūryaku-tennō) (418 - 8 September 479) was the 21st legendary Emperor of Japan, according to the traditional order of succession. He is remembered as a patron of sericulture. No firm dates can be assigned to this Emperor's life or reign, but he is conventionally considered to have reigned from 25 December 456 to 8 September 479.