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was an old province of Japan on Tsushima Island which occupied the area corresponding to modern-day Tsushima, Nagasaki.〔Nussbaum, Louis-Frédéric. (2005). "Provinces and prefectures" in .〕 It was sometimes called . ==Political history== The origin of Tsushima Province is unclear. It is possible that Tsushima was recognized as a province of the Yamato Court in the 5th century. Under the Ritsuryō system, Tsushima formally became a province. Tsushima Province has been a strategic area that took a major role in the national defense against possible invasions from the continent and in trade with Korea. After Japan was defeated by Tang dynasty at the Battle of Baekgang in 663, Kaneda Castle was constructed on this island. Tsushima Province had been controlled by the Tsushima no Kuni no miyatsuko until the Heian Period. This clan was later replaced by the Ahiru clan. The Sō clan rose to power around the middle 13th century and seized control of the entire island in the late 15th century. During the Edo Period, Tsushima Province was dominated by the Tsushima Fuchu domain (Izuhara domain) of the So clan. It was put in charge of diplomacy and monopolized trade with the Joseon Dynasty of Korea. As a result of the abolition of the han system, the Tsushima Fuchu domain became Izuhara Prefecture in 1871. In the same year, Izuhara Prefecture was merged into Imari Prefecture, which was renamed Saga Prefecture in 1872. Tsushima was transferred to Nagasaki Prefecture in 1872. At the same time, the province continued to exist for some purposes. For example, Tsushima is explicitly recognized in treaties in 1894 (a) between Japan and the United States and (b) between Japan and the United Kingdom.〔US Department of State. (1906). ( ''A digest of international law as embodied in diplomatic discussions, treaties and other international agreements'' (John Bassett Moore, ed.), Vol. 5, p. 759 ).〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tsushima Province」の詳細全文を読む スポンサード リンク
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