|Iwamura, Gifu Prefecture, Japan|
|Occupants||Tōyama clan, Mori clan, Matsudaira clan, Niwa clan|
The castle was first founded in 1185 by Kato Kagekado who was the vassal or retainers of Minamoto no Yoritomo and from the 13th to 16th centuries, it was in the fief of the Tōyama clan (遠山氏 Tōyama-shi). In the late 16th century, Toyama Kageto (who became a retainer of Oda Nobunaga) would be the last of the Toyama family to hold the castle.
Siege of Iwamura
In 1572, after the Siege of Iwamura, Takeda Shingen took the castle and entrusted it to Akiyama Nobutomo. Lady Otsuya the widow of Toyama Kageto, decided not to cause further bloodshed and ceased attacks, negotiated the castles surrender and her own marriage to Nobutomo—for protection.
From July–December 1575, Oda Nobunaga attacked and took the castle, and after a 6-month siege he promised Otsuya and Nobutomo safety and his life if he ended holding out. However he reneged on his word and had Nobutomo and Otsuya executed by hanging upside down—a punishment usually reserved for traitors.
Nobunaga placed the castle under the command of Toyotomi Hideyoshi. Hideyoshi in turn transferred power of Iwamura Castle to Tamaru Tomotada. After the Battle of Sekigahara in 1600, it was occupied under Tokugawa rule by the Ogyu Daimyō from 1601 to 1638, by the Niwa clan from 1638 to 1702, and finally by the Ishikawa clan from 1702 until the end of the Tokugawa period in 1868.
In 1873 Iwamura Castle was dismantled under a castle abolishment law. Today some stone walls and a turret are what remains of the old castle. Today Iwamura Castle is considered in the top 3 examples of mountaintop castles in Japan.
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