of Iha Fuyu (1–11), 1976 and 1993, Heibonsha, Tokyo. [in Japanese] Ko Ryukyu This is his representative work and has remained an introduction to Okinawaology. He had corrected previous articles many times, and the reader should read the most recent edition. Linguistic study Studying various words of Ryukyu and Japan used in days gone by, he came to the conclusion that Okinawa and Japan share the same mother tongue. The studied words include akaru, akezu, akatonki, amori, etsuri, fuguri (scrotum), fuku, hae (glory), hau, hiji, hiraku, hoso (umbricus), kanashi, iga, ikasarete, ikibui, ikutokoro, ime, iriki, kabuchi, kotoi, kuwanari, magu, majimono, mamaki, maru, minjai, mitsumi, monowata, mumuji, naegu, nai (earthquake), nasu, nuuji, sakuri, sayumi, shichiyadan, shishi, taani, tane (penis), tsukakamachi, tsukura, tubi, ugonaari, uwanari, wa, watamashi, yagusami, yokoshi, yomu, and yuimaharu. The recent trend of the History of the Ryukyus Three representative statesmen were described. They were given posthumous court ranks at the enthronement of Emperor Taishō, and Iha gave a lecture about them at the Okinawa Normal School. They were Sai On, Haneji Choshu (Shō Shōken (向象賢)) and Giwan Chōho. They managed to govern Ryukyu between Satsuma and China. Iha regarded them as the most important figures in Ryukyuan history. Sai On's advice to the King: Negotiations with China are not difficult. If difficulties will arise, Kume people can manage to handle them. But Japan is not so. On one day, with only a piece of paper, a King may lose his position and it is definitely from Japan. Okinawa's stand: to Okinawa, who will rule in China does not matter. Okinawa is not allowed to stick to justice. Okinawan people endure everything in order to live, or eat. An Okinawan saying says that who will let us eat, whoever it is, is our master. This is the fate of Okinawan people until the day of the placement of Okinawa Prefecture. To Japan, namely to the Shimazu clan, it did not know how to treat Okinawa soon after the establishment of Okinawa Prefecture. Seven kinds of Omoro Sōshi Omoro Sōshi is a collection of songs, 1553 poems and 1267 poems (when the same songs are excluded) in 22 volumes, starting in the middle of the 13th century and ending in the middle of the 17th century. It may be called the Man'yōshū of Okinawa. Omoro is the abbreviation of Omori uta, or songs sung in the sacred places of Ryukyu.