Since the mid-15th century, Satsuma fought with the Ryukyu Kingdom for control of the Northern Ryukyu Islands, which lie southwest of Japan.
In 1609, Shimazu Iehisa requested permission from the shogunate to invade Ryukyu.
After a three-month war which met stiff resistance, Satsuma captured the Ryukyuan capital of Shuri and King Shō Nei.
In the ensuing peace treaty, Satsuma annexed the Amami and Tokara Islands, demanded tribute, and forced the King and his descendants to pledge loyalty to Satsuma's daimyō.

For the remainder of the Edo period, Satsuma influenced their politics and dominated their trading policies to take advantage of Ryukyu's tributary status with China.
As strict 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 Ryukyu, 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 influence in Ryukyu, 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 Ryukyu.

In 1871, however, Emperor Meiji abolished the han system, and the following year informed King Shō Tai that he was designated "Domain Head of Ryukyu Domain", transferring Satsuma's authority over the country to Tokyo.
Since the mid-15th century, Satsuma fought with the Ryukyu Kingdom for control of the Northern Ryukyu Islands, which lie southwest of Japan. In 1609, Shimazu Iehisa requested permission from the shogunate to invade Ryukyu. After a three-month war which met stiff resistance, Satsuma captured the Ryukyuan capital of Shuri and King Shō Nei. In the ensuing peace treaty, Satsuma annexed the Amami and Tokara Islands, demanded tribute, and forced the King and his descendants to pledge loyalty to Satsuma's daimyō. 
For the remainder of the Edo period, Satsuma influenced their politics and dominated their trading policies to take advantage of Ryukyu's tributary status with China. As strict 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 Ryukyu, 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 influence in Ryukyu, 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 Ryukyu. 
In 1871, however, Emperor Meiji abolished the han system, and the following year informed King Shō Tai that he was designated "Domain Head of Ryukyu Domain", transferring Satsuma's authority over the country to Tokyo.
Satsuma Domain