Origins of Ryukyu People & Culture

From Maritime Ryukyu, 1050–1650, by Gregory Smits (University of Hawaii Press, 2018), Kindle pp. 58-61:

The flow of people, culture, and technology into Okinawa, Kumejima, and Sakishima was mainly from north to south. Some of this flow came from Michinoshima, some from Korea, and most of it from Japan, especially western Kyushu and nearby islands. Tanigawa Ken’ichi has metaphorically called it an “attack of northern culture.” Subsequent sections and chapters explore this topic further. Here I mention several physical manifestations of the north-to-south flow.

The climate in Okinawa is not suited to preserving skeletal remains, but there has been sufficient excavation and testing to warrant several conclusions. One is a significant break between the physical structure of prehistoric residents of Okinawa and those of later eras. Okinawan skeletal remains from about the eleventh or twelfth centuries onward begin closely to resemble their counterparts in Japan during the Kamakura and Muromachi periods. As Thomas Pellard points out, “The bearers of Gusuku [castle walls] culture expanded within the whole Ryukyu Archipelago, and preexisting foragers, who were few, simply died out or were assimilated without leaving a significant trace.” Omoro descriptions of the clothing and other aspects of the appearance of local rulers suggest that at least some were direct arrivals from Kamakura-era Japan. Furthermore, excavations of Okinawan weapons and armor reveal that they were the same as those used in Japan during the era of the Northern and Southern Courts (ca. 1335–1392) and the Muromachi period. In general, most military items excavated in Okinawa were made in Japan.

DNA evidence from recent studies is consonant with this situation. Studies of both modern and ancient DNA “tend to show that Ryukyuans form a group closely related to Mainland Japanese.” Moreover, despite geographical proximity, “Southern Ryukyuans do not show any particular affinity with the Austronesian populations of Taiwan, and they form a clear subgroup with Northern Ryukyuans.” Genetic diversity in the Ryukyu islands is relatively low, which indicates a lack of long-term isolation. In other words, the Ryukyu islands were part of a larger network, and the migration from regions to the north that populated the Ryukyu islands and brought Gusuku culture, “agriculture, ceramics, and the Proto-Ryukyuan language,” took place between approximately the tenth and twelfth centuries. Most likely the [turbo] shell trade was the major economic driving force behind much of this migration.

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Early Okinawa’s ties with China are well known and frequently discussed, whereas ties with northern areas typically receive less attention in survey histories. China played a vital role in early Ryukyuan history as a conduit of material wealth. Nevertheless, prior to the seventeenth century, Chinese high culture had little impact on Ryukyu. Early Ryukyu’s technology (metallurgy, agriculture, weapons), literary and aesthetic culture (including oral traditions), religious culture (including Buddhism), the various Ryukyuan languages, and the vast majority of Ryukyu’s people came from the north. Much of the region’s economic activity also took place north of Okinawa. One additional indication of the interconnectedness of the northern routes was the fact that distinctive Ryukyuan place-names found in the Omoro [ancient poems] were known to Hakata merchants and to Koreans and appeared on their maps.

The Takase-Fujian route mentioned above became popular around the 1340s, diverting maritime traffic from the previous route, a line from Hakata to Níngbō. The new route greatly increased traffic through the southern Ryukyu islands, but smaller-scale private trade, piracy, and smuggling based at locations in Okinawa and points to the southwest had been occurring since the twelfth century and probably earlier.

During the thirteenth century, Chinese ceramics began to appear at major gusuku sites in Okinawa and the southern Ryukyu islands. Fragrant wine and other products from as far away as Thailand and Vietnam also began to make their way into the Ryukyu islands at this time. For example, a four-eared jar from the Khwae Noi River in Thailand was excavated at Nakijin. After the start of formal tribute relations with Ming China in 1372, the material wealth of several major gusuku sites such as Kumejima, Katsuren, Shuri, and Nakijin increased dramatically. Celadon (green ware) ceramic dolls, Buddhist statues, candleholders, and other specialized products have been excavated at these sites, as well as a wide variety of metal goods. China was a source of great wealth, both directly and indirectly. To understand Ming China’s role in the development of Ryukyu, it is necessary to undertake a close study of wakō, the topic of the next chapter.