According to the Nihongi ryaku (c. 11th–12th centuries), Dazaifu, the administrative center of Kyushu, reported that the Nanban (southern barbarians) pirates, who were identified as Amami islanders by the Shōyūki (982–1032 for the extant portion), pillaged a wide area of Kyūshū in 997.
In accordance with the Nihongi ryaku (c. 11th–12th centuries), Dazaifu, the administrative hub of Kyushu, documented that the Nanban (southern outsiders) pirates, who were identified as Amami islanders by the Shōyūki (982–1032 for the extant portion), ravaged a broad region of Kyūshū in 997.