Kokokuji Castle is well known as the castle from which Hojo Soun rose to power. Soun became the lord of Kokouji Castle in 1487 for helping to quell the succession dispute among the Imagawa after the death of Imagawa Yoshitada. Yoshitada was married to Soun's sister. In 1491, Soun invaded Izu and Imagawa Yoshimoto was put in charge of Kokokuji Castle. After the hostilities settled down, Imagawa renovated the castle. As the Imagawa lost power, Kokokuji Castle became one of the points of struggle between the Takeda and Hojo. The Takeda took control in 1571 and kept the castle until their downfall when it came under the control of Tokugawa Ieyasu. After Ieyasu moved to Kanto, various lords served from Kokokuji Castle until it was abandoned in 1607.
There should also be a bus from Numazu, but I don't have the details. There was a bus stop right in front of the castle entrance named Negoya.
|English Name||Kokokuji Castle|
|Alternate Names||Fukadayama-jo, Nekoya-jo|
|Year Founded||around 1467-1487|
|Castle Condition||Ruins only|
|Designations||Next 100 Castles, National Historic Site|
|Historical Period||Pre Edo Period|
|Features||trenches, stone walls|
|Access||Hara Sta. (Tokidao Line), 30 min walk|
|Visitor Information||Open anytime|
|Time Required||30 mins|
|Location||Numazu, Shizuoka Prefecture|
|Coordinates||35° 8' 29", 138° 48' 25"|
|Visits||June 20, 2014|
|Added to Jcastle||2014|