The phonological inventory of Old Okinawan is often reconstructed according to modern Ryukyuan languages. Although the importance of historical resources is never ignored in the study of Okinawan historical linguistics, reconstruction based on historical sources is not well investigated yet, due to the two reasons that a) authors of previous…

Itoman, one of the varieties spoken in the southern part of Okinawa Island, exhibits several tone patterns. Although the tone patterns of Itoman were examined in previous studies (Nakasone ms., Hattori 1959, Oshiro 1963, and Hirayama et al. 1966), they ended at the descriptive level, and no phonological accounts for the surface tone patterns were…