Source: Isles of the Shackles, pg(s). 34
The Sublime Shogunate of Ushinawa was founded in the Ushinawa Isles by the samurai patriarch Tanagowu Useme nearly 2 centuries ago. Grown tired of the labyrinthic intrigues of Minkai politics, Useme led seven ships from Minkai to the Shackles on a journey halfway around the world. The fiercely independent samurai and his rowdy followers first set foot on what is now the largest of the Ushinawa Isles. The proud warriors fought the murderous kuru natives who populated the stony Ghol-Gan ruins that dotted the island. The bloody fighting last one month and at the end every kuru was put to the sword. The warriors and the Tian-Min sailors and servants who accompanied them established the newly limestone town of Genzei and within 4 years the nine other islands of the archipelago were similarly cleansed of their vile natives. The descendents of Useme have reigned these two centuries, though not without numerous challenges, as the arrogant and aggressive samurai offer their fealty only to the ruler who proves strong. The current Shogun is Tanagowu Heigo.
All pirates who call Ushinawa Isles their home pay a hefty tribute to Shogun but otherwise the isles boast great independence. Most inhabitanta are descendents of the original Tian-Min settlers but elves soured by the Witch-Queen Kaala of Kepre Dua have made a home in Ushinawa Isles, appreciating the bold meritocracy of the shogunate. A large number of tengus retired from their seagoing life, have also made their home here, usually tending shops and taverns or working the docks. Ushinawa samurai scorn slavery and don't permit enslaved persons on the islands.
Though the islands have been cleansed of the kuru and Ghol-Gan taint, adventurers still occasionally find entrances to deep dungeons. Most such sites are marked and sealed off immediately.