Kogakubou Castle Ruins | A Hidden Gem of Japanese History

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A Quiet Retreat into Japan’s Muromachi Period

Nestled in Koga City, Ibaraki Prefecture, Kogakubou Castle Ruins (Kogakubou Castle Ruins) offers a rare opportunity to step back into Japan’s feudal history. Established in the 15th century, this site was the stronghold of the Koga Kubou, a branch of the Kamakura Shogunate that ruled the Kanto region. Unlike Kyoto or Kamakura, which are often crowded with tourists, Kogakubou Castle Ruins provide a peaceful and authentic historical experience.

A Must-Visit for History Enthusiasts

This site holds historical significance as the place where Ashikaga Shigeuji, the fourth son of Kamakura Kubou Ashikaga Mochiuji, relocated after the Eikyo Rebellion (1438-1439). In 1449, Shigeuji came of age and later clashed with the Kanto Kanrei Uesugi clan, eventually moving from Kamakura to Koga in 1455, declaring himself the Koga Kubou. While he later relocated to the banks of the Watarase River, this site served as an annex to Koga Castle and was known as Konosu Gosho until its abolition in 1627.

Positioned on a peninsula jutting into Gosho-numa, the site was once surrounded by double moats, remnants of which, along with earthen mounds, can still be seen today. Recognized as an Ibaraki Prefecture-designated cultural property, this historical site offers a unique glimpse into Japan’s medieval past.

Nearby attractions such as the Koga History Museum and Takami Senseki Memorial Museum offer deeper insights into the samurai culture that once flourished in the area. Additionally, during spring, cherry blossoms bloom at Kogakubou Park, creating a stunning landscape perfect for appreciating Japan’s seasonal beauty. This hidden gem is perfect for affluent travelers seeking an exclusive and immersive cultural experience.