* Image is for illustrative purposes only.Usuki Castle
臼杵城
Usuki Castle is a historic castle in Kyūshū dating from the Founded 1557 (Kōji 3), whose lord was Ōtomo Sōrin / Ōta Kazuyoshi / Inaba clan.
Overview
About the Castle
Usuki Castle is a sea fortress located in Usuki City, Oita Prefecture, built by the Christian daimyō Ōtomo Sōrin on a rocky island in Usuki Bay in 1557 (Kōji 3). Sōrin was the greatest Sengoku daimyō of Kyushu, ruling six provinces—Bungo (Oita), Chikuzen (northern Fukuoka), Buzen (eastern Fukuoka and northern Oita), Hizen (Saga and Nagasaki), Higo (Kumamoto), and Chikugo (southern Fukuoka)—and at his peak wielded influence over two-thirds of Kyushu. Usuki Castle was strategically chosen by Sōrin to strengthen his authority over retainers and serve as a base for foreign trade, functioning as a natural fortress completely surrounded by sea at high tide.
The Castle of a Christian Daimyō
Ōtomo Sōrin actively embraced the Jesuit mission, welcoming Francis Xavier to Bungo Province (present-day Oita City) in 1551 (Tenbun 20). Sōrin received baptism under the Christian name "Francisco" in 1578 (Tenshō 6) and thereafter became known as a fervent Christian. Churches, monasteries, schools, and hospitals were built in the castle town of Usuki, and through trade with Portuguese merchants, Nanban (Southern Barbarian) culture flourished. The goods brought by Portuguese merchants—firearms, gunpowder, glassware, clocks, and carpets—accumulated in Usuki, Sōrin's seat, forming one of the most cosmopolitan castle towns in Sengoku Japan.
The Glory and Fall of the Ōtomo
In 1586 (Tenshō 14), Shimazu Yoshihisa of Satsuma advanced northward seeking to unify Kyushu, invading the territories of the Ōtomo clan one after another. Sōrin appealed to Toyotomi Hideyoshi for aid, and through Hideyoshi's Kyushu Conquest in 1587 (Tenshō 15), the Shimazu surrendered. However, Sōrin died at Usuki Castle in May of that same year, 1587 (Tenshō 15), in the midst of these conflicts, and the Ōtomo house rapidly declined. After the Battle of Sekigahara, Ōta Kazuyoshi and the Inaba clan became castle lords, and throughout the Edo period, the Inaba family governed Usuki, holding five man koku.
Castle Ruins and Castle Town
Today, the ruins of Usuki Castle retain stone walls, moats, earth bridges, and other structures, with the Ninomaru and Honmaru sites preserved as Usuki Park, beloved by citizens. Usuki is also nationally renowned for its stone Buddhas (Usuki Magaibutsu), and the nationally designated stone Buddha carvings testify to the depth of Buddhist culture. The castle town of Usuki preserves samurai residences, merchant houses, and soy sauce warehouses from the feudal period, forming an Important Preservation District for Groups of Historic Buildings, conveying the atmosphere of the Edo period to the present day. Usuki soy sauce enjoys high acclaim throughout Japan, and local soy sauce breweries such as Fundokin continue to brew their products with meticulous care to this day. Usuki, where the culture brought by the Nanban in Sōrin's era and the traditions of Bungo merged, continues to captivate many travelers as one of Kyushu's most historically and culturally distinguished castle towns.
International Cultural Heritage
Usuki Castle stands as the finest testament to how cosmopolitan Japan's exchange was during the Sengoku period, and as the stage of history left by Ōtomo Sōrin, it has become a representative example of Kyushu's castle architecture and culture. The tumultuous life of Ōtomo Sōrin—his transformation from the greatest daimyō of Kyushu to a Christian devoted to faith—continues to inspire historical novels and dramas to this day, perpetually elevating the historical significance and presence of Usuki Castle.
Connection to Swords
The sword culture at Ōtomo Sōrin's Usuki Castle embodies a turning point in the history of the Japanese blade, understood from the perspective of how medieval Japan underwent transformation through contact with the Nanban (Portuguese and Spanish) world. Sōrin was one of the pioneering daimyō who, in Tenbun 12 (1543), early adopted the firearms that had arrived at Tanegashima as a military force, and through commerce with Portuguese merchants secured a steady supply of gunpowder and lead. While the proliferation of firearms brought major transformation in the role of the Japanese sword, Sōrin simultaneously remained a custodian of traditional sword culture. The smiths of Bungo occupied a unique position within Kyushu's sword-making tradition, and the presence of sword forges is recorded in areas such as Bungo Takada and around Usuki. The blades carried by senior retainers of the Ōtomo house were often the work of Bungo smiths, and it is said that Sōrin himself possessed celebrated blades as family treasures. Portuguese swords (rapiers, espadas) that flowed into Usuki through Nanban trade brought Japanese sword craftsmen into contact with foreign sword aesthetics, becoming a catalyst for the incorporation of Nanban-influenced designs into sword fittings. The so-called "Nanban-tsuba" (Southern Barbarian-style sword guards) represent an important example of sword fittings reflecting this era's cultural exchange, and the influence that the age of Ōtomo Sōrin, centered at Usuki, exerted upon Japanese sword-fittings culture was considerable. After the Ōtomo house fell, during the Edo period when the Inaba family governed Usuki Castle, official sword smiths patronized by the Usuki domain supported the armament of domain samurai. At the former residence of the Usuki domain lord from the Inaba family, adjacent to Usuki Castle ruins—now the Usuki City Historical Materials Museum—weapons and materials connected to the Ōtomo and Inaba families are displayed, making it a facility of high value for those visiting from the perspective of sword culture. Before Sōrin's gaze overlooking Usuki's sea castle stretched a grand historical panorama where the Nanban seas and Japanese sword culture intersected.
Highlights
- Usuki Castle ruins (Usuki Park) — sea castle stone walls, moats, and cherry blossoms
- National Treasure Usuki Stone Buddhas — Heian-Kamakura era cliff carvings, masterpieces of Japanese sculpture
- Usuki castle town (Important Preservation District) — Edo-period samurai and merchant streetscapes
- Usuki City Museum — Ōtomo and Inaba clan arms, Nanban cultural artifacts
- Fundonokin Soy Sauce — heritage soy sauce brewery, part of Usuki's traditional culture
* Opening hours and admission fees are subject to change. Please check the official website before visiting.