Hyōtō Ryūkyū-koku ki
The Hyōtō Ryūkyū-koku ki (漂到流球国記) (loosely translated as Record of Drifting to the State of Ryūkyū') was a book written by Japanese Buddhist monk Keisei in 1244. He interviewed travelers who, during a sea voyage to Song China, drifted to what they believed to be Ryūkyū.