Kaneishi Castle is classified as a flatland castle, and is located in Nagasaki Prefecture. During the pre-modern age, it found itself within the borders of Tsushima Province. It is associated with the Sō clan. Dates in use: 1528 - 1871.

The island & province of Tsushima played a unique role & important role in Japan/Korea relations in the centuries (more like millennium) leading up to the modern era. Effectively bridging the two countries, the island acted as a way point for diplomats & military forces alike.

Dominant for centuries (actual centuries), the Sō clan fortified their central residence in the early/mid 1500's. The multitude of changes & expansions that would take place over the years resulted in this site transformed into a castle, a mountain fortress (Kiyomizuyama castle) and a new residential castle (Sajikihara castle). Little remains but stonework at all three sites.

Timeline

1528	A fortified residence was established at this site.
1587	The Sō clan were confirmed in their domain by Toyotomi Hideyoshi preceding Hideyoshi's pacification of the island of Kyūshū.
1669	The existing site was expanded upon and turrets added. Thereafter, it was referred to as Kaneishi castle.
1678	Sajikihara Castle, a residential-style castle was built. Kaneishi castle continued to be used.
1813	The turret-gate was lost in a fire.
1817	The turret-gate was rebuilt.
1919	The turret-gate was torn down.
1990	The turret-gate was rebuilt.
1995	The site achieved National Historic recognition.

Historical recognition

Site	National Historic Site
Garden	National Site of Scenic beauty