The origins of Iwasaki Castle are uncertain. It was built sometime in the early 16th century by Oda Nobuhide, the father of Oda Nobunaga in an attempt to protect his eastern borders against the aggressive Imagawa clan and is located at a strategic point on the highway connecting Mikawa Province with Owari Province.
After the victory of Tokugawa Ieyasu at the Battle of Sekigahara in 1600, the castle was abandoned. The Niwa clan received new domains in what is now the city of Toyota.
Today
The castle is now located in a two-hectare park.[3] Parts of the castle lie in ruins, including the remains of a well and a turret (yagura) which were discovered during archeological excavations. The donjon, or tenshu, was reconstructed in 1987 out of ferro-concrete and holds a museum local history museum with ceramics, samurai armor and documents on the history of the castle.
Further reading
De Lange, William (2021). An Encyclopedia of Japanese Castles. Groningen: Toyo Press. pp. 600 pages. ISBN978-9492722300.