Hotta-no-saku

The Hotta-no-saku ruins are the remains of a Heian period fortified settlement located in present-day Daisen and Misato, Japan. This large-scale site, designated a National Historic Site since 1931, is characterized by its massive wooden palisade, originally measuring approximately 1,370 meters by 780 meters. Dendrochronological analysis dates the construction of the palisade to 801 CE, marking it as one of the largest josaku-style castles in northern Japan during the early 9th century CE. Despite its size, historical records make no mention of this fortification. The site includes the ruins of an inner fortification and administrative complex, suggesting its role as a significant regional center before being abandoned by the mid-10th century CE. It now serves as an archaeological park with reconstructed buildings, offering insights into Japan's Heian period defensive architecture.