Hiraiwa Castle (Mikawa)

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MyoudaijiYashikiHiraiwajou (1).JPG


Hiraiwajō is another name for Myōdaijijō, but at this particular site, also referred to as the Myōdaijiko-yashiki, excavations have revealed the remains of a medieval residence and moats. Before the development of the (proto-)modern town of Okazaki, the main settlement here was Myōdaiji. It was located along the Tōkaidō, Japan’s main trade route linking the east and west of the country. It seems Hiraiwajō was used to protect the settlement and as a residence of the Saigō Clan. It may have been used up until 1590, after Myōdaijijō was abandoned, and used as a satellite fortification of Okazakijō under the Matsudaira. However, after Tokugawa Ieyasu relocated to Edo in 1590, Myōdaiji was abandoned in favour of building up the town around Okazakijō.

Visit Notes

There is a sign post here under an elevated walkway which proclaims the site of Hiraiwajō. An explanation board details the history of the site with pictures showing the excavations of the remains of building foundations and trenches. Above looms a statue of Tokugawa Ieyasu mounted on a horse. The site should properly be called Myōdaijiko-yashiki, but the sign calls it Hiraiwajō.

This site is part of a group of fortification sites in Myōdaiji. See also Myodaiji Castle, Myodaijiko Castle and Okazaki Castle.

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  • Statue of Tokugawa Ieyasu outside Higashi-Okazaki Station

Castle Profile
English Name Hiraiwa Castle (Mikawa)
Japanese Name 三河平岩城
Alternate Names Myōdaijiko-yashiki (明大寺古屋敷)
Founder Saigō Clan
Year Founded 14th century
Castle Type Fortified Manor
Castle Condition Ruins only
Historical Period Pre Edo Period
Visitor Information
Access Higashi-Okazaki Station on the Nagoya Main Line; 2 minute walk
Visitor Information
Time Required 10 minutes
Website https://minkara.carview.co.jp/userid/157690/spot/834779/
Location Okazaki, Aichi Prefecture
Coordinates 34° 57' 9.40" N, 137° 10' 9.19" E
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Added to Jcastle 2023
Contributor ART
Admin Year Visited Viewer Contributed

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