“Sasayama castle was one of the castles built to surround Osaka castle in 1609 by order of Ieyasu Tokugawa. Twenty feudal lords were summoned by Tenka bushin (construction order of Tokugawa Shogunate), and the construction of the castle was completed in half a year. Most of the construction was demolished during the Meiji Era, with only the Ohshoin (large administrative chamber) remaining. This chamber was destroyed by fire in 1944, but the main structure of the castle, including the stone wall and moats, remain in good condition. The Sasayama Castle was designated a National Heritage Site in 1956. Over the years, numerous restorations have been completed, including the stone wall and the reconstruction of the Ohshoin.”