It's not clear exactly when Senpuku Castle was built but it appears in temple records from 1572 and is conspicuously missing from similar records from 1545, so it was likely built in between. The castle is one step into the Sunto area and Hojo lands so it was likely a forward outpost for the Kazurayama when they expanded to the East. Fumyoji Temple is at the base of the mountain and corresponds to the area that was the lord's home.
At the end of June the site was already mostly overgrown and difficult to get through. There really isn't anything to see here apart from some leveled areas and a couple trenches if you can make them out. I can't recommend a visit unless you just happen to be riding by, as I was.
|English Name||Senpuku Castle|
|Year Founded||mid 1500's|
|Castle Condition||Ruins only|
|Designations||Local Historic Site|
|Historical Period||Pre Edo Period|
|Access||Susono Sta (Gotenba Line); 40 min walk|
|Visitor Information||Does not seem to be any maintained trails.|
|Time Required||20 mins|
|Location||Susono, Shizuoka Prefecture|
|Coordinates||35° 11' 33", 138° 54' 18"|
|Visits||June 20, 2014|
|Added to Jcastle||2014|