The Hayato might have been the same as the Kumaso group of around the same time, but while the Kumaso are mentioned in the more legendary portions of the Nihon Shoki, the Hayato are recorded in various historical texts until the beginning of the Heian period. Though the Kumaso are generally portrayed as rebellious, the Hayato are listed among the attendants of emperors and princes from as early as Emperor Nintoku's reign. This, along with a mention of Hayato crying before the grave of Emperor Yūryaku after his death, suggests that the Hayato were naturalized as personal servants by the late 7th century.