The exact date of the castle's foundation is unknown but built in the
Muromachi period. In 1543,
Uesugi Kenshin left
Kasugayama Castle and entered the castle as a joint commander by
Nagao Harukage`s order. In 1548, Kenshin returned to
Kasugayama Castle as a feudal lord of the
Nagao clan. The castle is now only ruins, with some earthenwalls, well and moats. Its ruins have been protected as a
Prefectural Historic Site. ==See also==