...then to Kagoshima, where he is forced…

May 1609 CE

...then to Kagoshima, where he is forced to more formally surrender and to declare a number of oaths to the Shimazu clan.

The king and his councilors are made to swear that "the islands of Riu Kiu have from ancient times been a feudal dependency of Satsuma", and that there is a long-standing tradition of sending tribute and congratulatory missions on the succession of the Satsuma lords, though these are all falsehoods.

The oaths also include stipulations that the kingdom admit its wrongdoing in ignoring and rejecting numerous requests for materials and for manpower, that the invasion is justified and deserved, and that the lord of Satsuma is merciful and kind in allowing the king and his officers to return home and to remain in power.

Finally, the councilors are forced to swear their allegiance to the Shimazu over their king.

Tei Dō, a royal councilor and commander of the kingdom's defense against the invasion, refuses to sign the oaths and is beheaded.

The kingdom's royal governmental structures remain intact, along with its royal lineage.

The Ryukyus remain nominally independent, a "foreign country" to the Japanese, and efforts are made to obscure Satsuma's domination of Ryukyu from the Chinese Court, in order to ensure the continuation of trade and diplomacy, since China refuses to conduct formal relations or trade with Japan at this time.

However, though the king retains considerable powers, he is only permitted to operate within a framework of strict guidelines set down by Satsuma, and is required to pay considerable amounts in tribute to Satsuma on a regular basis.

This framework of guidelines is largely set down by a document sometimes called the Fifteen Injunctions, which accompanies the oaths signed in Kagoshima in 1611, and which details political and economic restrictions placed upon the kingdom.

Prohibitions on foreign trade, diplomacy, and travel outside of that officially permitted by Satsuma are among the chief elements of these injunctions.

Ryukyu's extensive trade relations with China, Southeast Asia, and Korea are turned to Satsuma's interests, and various laws are put into place forbidding interactions between Japanese and Ryukyuans, travel between the two island nations.

Likewise, travel abroad from Ryukyu in general, and the reception of ships at Ryukyu's harbors, are heavily restricted with exceptions made only for official trade and diplomatic journeys authorized by Satsuma.

In addition, Amami Ōshima and a number of other northern islands now known as the Satsunan Islands are annexed into Satsuma Domain and removed from the kingdom's territory.

These islands remain today part of Kagoshima Prefecture, not Okinawa Prefecture.