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'Oki' (隠岐国; -no kuni) was an old province of Japan, which consisted of the Oki Islands in the Sea of Japan, located off the coast of the provinces of Izumo and Hoki.
The Oki Islands comprise two relatively big islands and some smaller ones. The capital of the province was located where the present-day city of Saigo stands, but few relics of the old capital have been found, apart from the provincial temple, which remains today in Saigo city
Oki was an exile site, and both Emperor Go-Toba and Emperor Go-Daigo were exiled to this province.
From the Kamakura period Oki Province was governed primarily by the shugo of Izumo province. In the Muromachi period, it was ruled successively by the Sasaki clan, the Yamana clan and the Kyogoku clan. In the Sengoku period the Amako clan held this province. After they fell and the Tokugawa Shogunate arose, the Shogunate declared the province a dominion of the shogun and appointed as governor Matsue han, a daimyo belonging to the Matsudaira clan, relatives of the Shogun. At this time the rice production from Oki province was calculated at five thousand koku per year.
Today it is Oki District, Shimane, a part of Shimane prefecture.