The themes of the Omoro include the origin of Ryukyu, Kings, Heroes, Voyages, Poets, Sceneries, Heaven and Stars, very rarely Romance. Omoro is the primary source for studying the Ryukyuan languages and ideologies. The problem of students studying in China (Kansho) China allowed Ryukyuan princes and others to study in China; at first, Ryukyuan students did not get good achievements. The great king Shō Shin started to allow the people of the town of Kume, who had come from China only 128 years before, to study in China. They spoke Chinese of course, and got high achievements. Four students from Kume who studied in Nanjing came back seven years later. Four others on the next turn, came back seven years later. The people of Kume eventually came to believe that students only came from Kume. Toward the end of the 18th century, the Ryukyuan government, based in Shuri, realized that education and politics went hand in hand and thought students should be also from Shuri. The people of Kume resisted with strikes. This is called the Kansho Problem or Soudou. The P sound in Okinawan dialects The changes of the sound of P → F → H in Ryukyuan dialects suggest the changes from P through F to H in the languages of historical Japan proper. Take care that this is in Ko Ryukyu. In Late Middle Japanese it is written that although Proto-Japanese had a *[p], by Old Japanese it had already become [ɸ] and subsequently [h] during Early Modern Japanese where it remains today. Other Works The weakest point of Okinawan People, The establishment of Okinawa Prefecture from the viewpoint of evolution, Did Heike people really come to Sakishima? Important place Urasoe, What does Shimajiri mean in many islands of Okinawa? A mysterious man Amawari, Documents of Wakou in Okinawa, A lovely Yaeyama girl, Nakasone Toyomiya in Miyako, Grand kumi stages of old Ryukyu, Poems of Southern Islands, The Bible translated into the Ryukyu language by Bernard Jean Bettelheim, On Konkō-kenshū (Old Ryukyu language dictionary), Akainko, the first Okinawan music musician. Mythologies in Okinawa. Okinawaology Okinawaology is not an independent field of science, but a general term of various aspects of Okinawa studies. Okinawaology originated from Iha's Ko Ryukyu (Old Ryukyu). In General Since Ryukyu was annexed by Japan, the Okinawan people were forcefully assimilated into Japanese imperial culture. With this as the background, Iha studied the culture