Ryūkyū-koku yurai-ki (琉球国由来記, Records of the Origin of the Ryūkyū Kingdom) is a chorography compiled by the government of the Ryukyu Kingdom. It was the first chronography compiled by the royal government and was presented to King Shō Kei in 1713. It is an essential resource for Okinawan studies. This book was largely written in Japanese. Later Tei Heitetsu (鄭秉哲) wrote its Kanbun translated version and titled it Ryūkyū-koku kyū-ki (琉球国旧記). Source: Wikipedia (en)