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In 1609, the Shimazu requested permission from the shogunate to invade the Ryûkyû Kingdom which lay to its south. After a brief invasion which met little resistance, Satsuma seized a number of the northern [[Ryukyu Islands|Ryûkyû Islands]],<ref>including [[Amami Oshima|Amami Ôshima]], [[Tokunoshima]], [[Okinoerabujima]], [[Yoronjima]], and [[Kikaigashima]].</ref> annexing them to the ''han'', and claimed the Ryûkyû Kingdom as a vassal state. For the remainder of the Edo period, Satsuma exacted tribute from Ryûkyû, influenced its politics, and dominated its trading policies. As strict [[kaikin|maritime prohibitions]] were imposed upon much of Japan beginning in the 1630s, Satsuma's ability to enjoy a trade in Chinese goods, and information, via Ryûkyû, provided it a distinct and important, if not entirely unique, role in the overall economy and politics of the Tokugawa state. The degree of economic benefits enjoyed by Satsuma, and the degree of their oppression of Ryûkyû, are subjects debated by scholars, but the political prestige and influence gained through this relationship is not questioned. The Shimazu continually made efforts to emphasize their unique position as the only feudal domain to claim an entire foreign kingdom as its vassal, and engineered repeated increases to their own official [[Court rank]], in the name of maintaining their power and prestige in the eyes of Ryûkyû.

In 1609, the Shimazu requested permission from the shogunate to invade the Ryûkyû Kingdom which lay to its south. After a brief invasion which met little resistance, Satsuma seized a number of the northern [[Ryukyu Islands|Ryûkyû Islands]],<ref>including [[Amami Oshima|Amami Ôshima]], [[Tokunoshima]], [[Okinoerabujima]], [[Yoronjima]], and [[Kikaigashima]].</ref> annexing them to the ''han'', and claimed the Ryûkyû Kingdom as a vassal state. For the remainder of the Edo period, Satsuma exacted tribute from Ryûkyû, influenced its politics, and dominated its trading policies. As strict [[kaikin|maritime prohibitions]] were imposed upon much of Japan beginning in the 1630s, Satsuma's ability to enjoy a trade in Chinese goods, and information, via Ryûkyû, provided it a distinct and important, if not entirely unique, role in the overall economy and politics of the Tokugawa state. The degree of economic benefits enjoyed by Satsuma, and the degree of their oppression of Ryûkyû, are subjects debated by scholars, but the political prestige and influence gained through this relationship is not questioned. The Shimazu continually made efforts to emphasize their unique position as the only feudal domain to claim an entire foreign kingdom as its vassal, and engineered repeated increases to their own official [[Court rank]], in the name of maintaining their power and prestige in the eyes of Ryûkyû.

Satsuma remained the second wealthiest domain (in terms of official ''kokudaka'' rating) and among the most powerful throughout the Edo period. This derived not only from their connection to Ryûkyû, but also from the size and productive wealth of Satsuma province itself, and from their extreme distance from [[Edo]], and thus from the [[Shogun]]'s armies. The Shimazu exercised their influence to exact from the shogunate a number of special exceptions. Satsuma was granted an exception to the shogunate's limit of one castle per domain, a policy which was meant to restrict the military strength of the domains. Satsuma had the highest proportion of samurai in its population of any domain, roughly 1/4,<ref>Norman, E.H. ''Soldier and Peasant in Japan: The Origins of Conscription''. New York: Institute for Pacific Relations, 1945. p44.</ref> as compared to 1/10 in most parts of the archipelago. Contrary to the policy of removing the samurai from the countryside and consolidating them in the domainal capital, as was standard in most domains, the Shimazu were able to form sub-fiefs within their domain, and to dole out castles to their retainers, administering the domain in a manner not entirely unlike a microcosm of the Tokugawa state(s) itself. The Shimazu also received special exceptions from the shogunate in regard to the policy of ''[[sankin kotai|sankin kôtai]]'', another policy meant to restrict the wealth and power of the ''daimyô''. Under this policy, every feudal lord was mandated to travel to Edo at least once a year, and to spend some portion of the year there, away from his domain and his power base. The Shimazu were granted permission to make this journey only once every two years. These exceptions thus allowed Satsuma to gain even more power and wealth relative to the majority of other domains.

Satsuma remained the second wealthiest domain (in terms of official ''kokudaka'' rating) and among the most powerful throughout the Edo period. This derived not only from their connection to Ryûkyû, but also from the size and productive wealth of Satsuma province itself, and from their extreme distance from [[Edo]], and thus from the [[Shogun]]'s armies. The Shimazu exercised their influence to exact from the shogunate a number of special exceptions. Satsuma was granted an exception to the shogunate's limit of one castle per domain, a policy which was meant to restrict the military strength of the domains. Satsuma had the highest proportion of samurai in its population of any domain, roughly 25%,<ref>Norman, E.H. ''Soldier and Peasant in Japan: The Origins of Conscription''. New York: Institute for Pacific Relations, 1945. p44.</ref> as compared to 6% in most parts of the archipelago.<ref>Robert Hellyer, ''Defining Engagement'', Harvard University Press (2009), 25.</ref> Contrary to the policy of removing the samurai from the countryside and consolidating them in the domainal capital, as was standard in most domains, the Shimazu were able to form sub-fiefs within their domain, and to dole out castles to their retainers, administering the domain in a manner not entirely unlike a microcosm of the Tokugawa state(s) itself. Most of these rural samurai lived in separate samurai villages, watching over neighboring peasant villages and effecting tax collection; this was in contrast to the system in place in most domains, in which village heads were responsible, within a hierarchy of peasant and samurai officials, for the collection of taxes.<ref>Hellyer, 28.</ref> The Shimazu also received special exceptions from the shogunate in regard to the policy of ''[[sankin kotai|sankin kôtai]]'', another policy meant to restrict the wealth and power of the ''daimyô''. Under this policy, every feudal lord was mandated to travel to Edo at least once a year, and to spend some portion of the year there, away from his domain and his power base. The Shimazu were granted permission to make this journey only once every two years. These exceptions thus allowed Satsuma to gain even more power and wealth relative to the majority of other domains.

Though arguably opposed to the shogunate, Satsuma was perhaps one of the strictest domains in enforcing particular policies. Christian missionaries were seen as a serious threat to the power of the daimyô, and the peace and order of the domain; the shogunal ban on Christianity was enforced more strictly and brutally in Satsuma, perhaps, than anywhere else in the archipelago. The ban on smuggling, perhaps unsurprisingly, was not so strictly enforced, as the domain gained significantly from trade performed along its shores, some ways away from [[Nagasaki]], where the shogunate monopolized commerce.

Though arguably opposed to the shogunate, Satsuma was perhaps one of the strictest domains in enforcing particular policies. Christian missionaries were seen as a serious threat to the power of the daimyô, and the peace and order of the domain; the shogunal ban on Christianity was enforced more strictly and brutally in Satsuma, perhaps, than anywhere else in the archipelago. The ban on smuggling, perhaps unsurprisingly, was not so strictly enforced, as the domain gained significantly from trade performed along its shores, some ways away from [[Nagasaki]], where the shogunate monopolized commerce.