Ishibashijō was constructed by Ishibashi Hisakatsu in the 15th century. Hisakatsu adopted the name Ishibashi, but he was the second son of Okudaira Sadahisa, and the grandson of Okudaira Sadatoshi. Ishibashi Shigemasa, Hisakatsu’s son, conspired to rebel in 1537, but his plans were uncovered, and he was attacked by Tosa Sadao under the orders of Okudaira Sadakatsu. Sadakatsu’s was a young man at the time and so it is speculated that Ishibashi Shigemasa thought he could take advantage of his lord’s inexperience to usurp control of the clan. He failed. Ishibashijō was attacked and forty-two rebels were killed (and or including their families); the castle was destroyed at this time. Ishibashi was slain, and his own young son, Tarōjirō escaped, only to be later captured and put down. A temple, Jishōin, was then built in the precincts of the ruined castle, in part to console those killed in the massacre (‘shō’ is the same zodiograph as ‘masa’ in Shigemasa’s name). If Lord Sadakatsu had let just one member of the Ishibashi family survive, perhaps he would never have known peace. Sadakatsu led the Okudaira Clan through a turbulent time, withstanding the shockwaves of the Matsudaira, Oda, Imagawa and Takeda clans; his son would go on to serve Tokugawa Ieyasu.
Ishibashijō, an earthworks fort ruins, is now the site of a local temple, but it retains castle features to the rear, including dorui (earthen ramparts) and hori (moats). I was surprised to see how tall the rear dorui was. The front of the site just looks like a temple, albeit with a very steep slope which looks suspiciously like a fort’s steep embankments, a feature called kirigishi. The dorui includes a corner segment and part of the ramparts disappear behind the temple’s main hall. There was an opening cut into the rear of the bulwark so I looked beyond here. It was a bit overgrown but I could see moats, now a morass. Due to the overgrown moats and temple we do not have free reign as castle-explorers here, but it makes for a nice casual visit alongside more impressive sites in the area.
|English Name||Ishibashi Castle|
|Year Founded||15th Century|
|Castle Type||Fortified Manor|
|Castle Condition||Ruins only|
|Historical Period||Pre Edo Period|
|Artifacts||Dorui, Dobashi, Karabori|
|Visitor Information||24/7; Free; Temple|
|Time Required||30 minutes|
|Location||Shinshiro, Aichi Prefecture|
|Coordinates||34° 57' 50.72" N, 137° 25' 11.93" E|
|Added to Jcastle||2023|
|Admin Year Visited||Viewer Contributed|
|Friends of JCastle|