Kojiki: Records of Ancient Matters · Section 78
Emperor Kei-kō (Part III.—Various Deeds)
78.1In this august reign the Labourers’ Tribe was established; again, the port of Aha in the East was established; again, the Great Butlers’ Tribe was established; again, the granaries of Yamato were established; again, the Pool of Sakate was made, and bamboos planted on its bank.