Emperor Ingyō (允恭天皇) was the 19th imperial ruler of Japan. 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 Nintoku and the empress Iwanohime, therefore a younger brother of his predecessor Hanzei. He sat on the throne after Hanzei died and ruled for 41 years. His empress was Oshisakanooonakatsunohime. They had five sons and four daughters, including Anko and Yuryaku. 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 and sent messangers to the Song Dynasty at least twice, in 443 and 451.
