Ohkusa Castle (Mikawa)

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MikawaOhkusajou (1).jpg


Ôkusajō was the fortified residence of the Saigō Clan, constructed by Saigō Tsugiyori in middle Muromachi period (circa 1430s). Tsugiyori expanded from Ôkusajō and built Myōdaijijō (Myodaiji Castle), and then began spreading his territory southward. At this time, Shōrakuji was established as the clan's bodaiji (ancestral temple) at Ôkusajō. Upon clashing with the Matsudaira Clan, Tsugiyori constructed Ryūtōzanjō (Okazaki Castle) in 1455. The clan was ambitious, originally being the dominant force in Mikawa, but, during the reign of Saigō Yoritsugu, was quelled by the Matsudaira Clan in the late 15th century, losing a pivotal battle at Anshōjō (Ansho Castle); Yoritsugu was compelled to adopt Matsudaira Nobumitsu's son, Mitsushige, as his own heir. Matsudaira Mitsushige founded the Ôkusa branch (initially called the Okazaki branch) of the Matsudaira Clan. In the early 16th century, Matsudaira Nobusada fought with Matsudaira Kiyoyasu for dominance - losing, and falling back to Ôkusajō. The Ôkusa branch was thereafter subordinate to the main branch which gave rise to Tokugawa Ieyasu. In 1563, however, under Ôkusa Masahisa, Ôkusajō was used in support of the rebels during the Mikawa-Ikkō-Ikki uprising, and was thereafter abandoned after the rebellion failed.

Visit Notes

Ôkusajō is a fortified residence site in the Ôkusa area of Kōta Township, Nukata County. No ruins remain and the site is now a temple, Shōrakuji, which is the ancestral temple of the Saigō Clan which originally built the castle.

Note: this is Ôkusajō in Mikawa Province, not to be confused with the several sites of the same name throughout Owari Province (also part of Aichi Prefecture).


Castle Profile
English Name Ohkusa Castle (Mikawa)
Japanese Name 三河大草城
Founder Saigō Tsugiyori
Year Founded 1430s
Castle Type Fortified Manor
Castle Condition Ruins only
Historical Period Pre Edo Period
Visitor Information
Access Aimi Station on the Tōkaidō Main Line; 30 minute walk to Shōrakuji
Visitor Information 24/7 free; temple
Time Required 10 minutes
Location Okazaki, Aichi Prefecture
Coordinates 34° 52' 54.70" N, 137° 10' 30.94" E
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Added to Jcastle 2023
Contributor ART
Admin Year Visited Viewer Contributed
Friends of JCastle
Jōkaku Shashin Kiroku
Umoreta Kojō
Jōkaku Hōrōki
Aichi Shiro

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