Shō Shin
Though Okinawan encompasses a number of local dialects, the Shuri–Naha variant is generally recognized as the "de facto" standard, as it had been used as the official language of the Ryūkyū Kingdom since the reign of King Shō Shin (1477–1526). Moreover, as the former capital of Shuri was built around the royal palace, the language used by the royal court became the regional and literary standard, which thus flourished in songs and poems written during that era.