Koma Atsushiba Yashiki

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Atsushiba-yashiki in the historical Koma County is said to be the birthplace of the Ogasawara Clan, a noteworthy clan who would go on to dominate Shinano Province. From 1185, at the dawn of the feudal era, Nagakiyo, the second son of Kagami Tômitsu, took charge of the Ogasawara-maki, a ranch used by Imperial government to breed horses for war, and, at the start of the Kamakura period, began the Ogasawara Clan here, building a manor hall known as the Atsushiba-yashiki. It is also known as the Ogasawara-yashiki. The neighbourhood today, located in Akeno Township of Hokuto Municipality, is also called Ogasawara.

Visit Notes

Ruins of Atsushiba-yashiki are said to include dorui (earthen ramparts) and kuruwa (baileys), but the site today is covered in rice paddies so it can be difficult to distinguish the terracing for fields from embankments which were once fortified. However, the most likely area surrounds the shrine (Yasaka-jinja); the terraces and mounds around the paddies are tall. Fields to the south and west of the shrine stand out as being possible bailey sites.


Castle Profile
English Name Koma Atsushiba Yashiki
Japanese Name 巨摩厚芝屋敷
Alternate Names Ogasawara-yashiki
Founder Ogasawara Clan
Year Founded Kamakura Period
Castle Type Fortified Manor
Castle Condition Ruins only
Historical Period Pre Edo Period
Artifacts Dorui, Kuruwa
Visitor Information
Access Nearest station is Shinpu Station on the Chūō Main Line
Visitor Information Fields
Time Required 20 minutes
Location Hokuto, Yamanashi Prefecture
Coordinates 35° 45' 1.91" N, 138° 27' 4.28" E
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Added to Jcastle 2022
Contributor ART
Admin Year Visited Viewer Contributed
Friends of JCastle
Oshiro Tabi Nikki

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