Hara Castle

Lore & Background

Hara Castle was built in 1496 by Arima Takazumi on a hill jutting into the Ariake Sea, originally as a subsidiary castle of Hinoe Castle. At the end of the 16th century, Arima Harunobu, who had gained knowledge of castles during the Japanese invasions of Korea (1592–1598), rebuilt it as his main stronghold. Jesuit records confirm that at least the main citadel, with stone walls, was built between 1599 and 1604, transforming it into an Azuchi-Momoyama period castle with a tiled roof and multiple citadels. The stone walls, square moat, and foundations of the tenshu tower that remain today are from this renovation.

Reader's Guide

Hara Castle's significance lies in its dual role as a Sengoku-period fortress and as the focal point of the Shimabara Rebellion, a major uprising against the Tokugawa shogunate. The castle's ruins provide archaeological evidence of the rebellion, including remains of rebels, lead bullets, rosaries, and crucifixes, reflecting the Catholic persecution context. The 2000 excavation confirmed one of the largest castle gates in Japan, measuring 90 by 80 meters, and identified the foundations of the residence of Amakusa Shiro, a rebel leader. The site's inclusion in the UNESCO World Heritage List in 2018, alongside other sites linked to Catholic persecution, underscores its importance in understanding Japan's history of religious conflict and castle architecture. The escape route on the Ariake Sea side, investigated after a 1963 collapse, remains uncertain in origin, adding to the site's historical intrigue.

Did You Know?

• Hara Castle was built in 1496 by Arima Takazumi as a subsidiary castle of Hinoe Castle.
• During the Shimabara Rebellion (1637–1638), rebels barricaded themselves in the abandoned castle for many months.
• Archaeological excavations unearthed remains of rebels, lead bullets, rosaries, and crucifixes.
• The 2000 excavation confirmed one of the largest castle gates in Japan, measuring 90 by 80 meters.