Qualla: Iwasaki Castle: The Fortress That Changed Hands with Every War

Iwasaki Castle: The Fortress That Changed Hands with Every War: Introduction

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Asturio Cantabrio, CC BY-SA 4.0. Every great family that shaped the Sengoku period left fingerprints on this small hill castle in what is now the city of Nisshin. Oda Nobuhide built it. Matsudaira Kiyoyasu seized it. The Niwa clan held it for half a century until Toyotomi Hideyoshi's army stormed the walls and killed 300 defenders, including the garrison commander's brother. Tokugawa Ieyasu's final victory at Sekigahara in 1600 made the castle irrelevant, and it was abandoned to the elements. Iwasaki Castle is not famous the way Himeji or Osaka Castle is famous. It is something more intimate: a place where the personal ambitions and family rivalries that tore Japan apart for a century left marks you can still read in the hillside.

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Image: Asturio Cantabrio | CC BY-SA 4.0

Iwasaki Castle: The Fortress That Changed Hands with Every War: A Father's Fortification

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Ajax, CC BY-SA 4.0. Sometime in the early sixteenth century, Oda Nobuhide -- father of the man who would begin Japan's unification -- built a castle on a hill overlooking the highway that connected Mikawa Province with Owari Province. The Imagawa clan to the east posed a constant threat, and Nobuhid...

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Image: Ajax | CC BY-SA 4.0

Iwasaki Castle: The Fortress That Changed Hands with Every War: The Matsudaira Seizure

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Alexrk2, CC BY-SA 3.0. In 1529, the castle changed hands without a prolonged siege. Matsudaira Kiyoyasu, an aggressive young warlord and the grandfather of the future Tokugawa Ieyasu, captured Iwasaki and made it the headquarters for the Matsudaira clan's operations in the region. Kiyoyasu's ambitions,...

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Image: Alexrk2 | CC BY-SA 3.0

Iwasaki Castle: The Fortress That Changed Hands with Every War: Three Hundred Dead on the Castle Hill

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit Bariston, CC BY-SA 4.0. The Niwa clan's tenure ended violently in 1584. The Battle of Iwasaki Castle was one engagement in the larger Battle of Komaki and Nagakute, the last major armed conflict between Toyotomi Hideyoshi and the forces aligned with Tokugawa Ieyasu. Hideyoshi's army, commanded by the ve...

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Image: Bariston | CC BY-SA 4.0

Iwasaki Castle: The Fortress That Changed Hands with Every War: Concrete, Ceramics, and Memory

Mon, 16 Feb 2026 00:00:00 GMT

Photo credit 江戸村のとくぞう, CC BY-SA 3.0. Today Iwasaki Castle sits in a two-hectare park in Nisshin, a suburban city absorbed into the greater Nagoya metropolitan area. Archaeological excavations have uncovered the remains of a well and a yagura, or turret, revealing the outlines of the original fortification beneath th...

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Image: 江戸村のとくぞう | CC BY-SA 3.0