[2] Young Uesugi Kenshin spent five years in the castle.

[3][4] The exact date of the castle's foundation is unknown but built in the Muromachi period.

[4] In 1544, Kenshin made his first battle against local lords opposed to the Nagao clan in the castle and broke the siege.

[5] In 1548, Kenshin returned to Kasugayama Castle as a feudal lord of the Nagao clan.

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