Emperor Ingyō (允恭天皇 Ingyō Tennō) was the 19th emperor of Japan, according to the traditional order of succession. No firm dates can be assigned to this emperor or to his reign, but he is believed to have ruled the country during the mid-5th century CE.
According to Kojiki and Nihonshoki, he was the 4th son of Emperor Nintoku and his consort Iwanohime, and therefore a younger brother of his predecessor Emperor Hanzei. He sat on the throne after Hanzei died and ruled for 41 years. His consort was Oshisaka no Ōnakatsu no Hime. They had five sons and four daughters, including Emperor Ankō and Emperor Yūryaku. He reformed the system of family and clan names, because many named themselves false names using higher ranked clan or family names.
Today scholars identify him with King Sai in the Book of Song, who was a king of Japan (referred to as Wa by contemporary Chinese scholars) and sent messengers to the Song Dynasty at least twice, in 443 and 451.
According to contemporary historians, eighty Korean musicians were brought over to play at his funeral, importing Korean and Chinese musical styles to Japan. 
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