The Brass Castle (ブラス城) is a location in Suikoden III.
Built directly on the border between the Zexen Confederacy and the Grasslands, Brass Castle serves as the first line of defence for any western attack into the Zexen Confederacy. The castle was finished in the year 422 during the First Fire Bringer War in order to fortify the region from the Grassland tribes. The castle is built on an "island" between two canyons, connected to the mainland by two large, stone bridges. The castle's walls are quite high, so much so that those on the interior of the fortresses walls cannot look beyond them to the mountains outside of the castle. The castle is well staffed by many Zexen Knights who are stationed to protect the interior, making the heavily fortified Brass Castle one of the most powerful defensive structures in Zexen. Shortly following construction of the castle, the town of Brass was built up around it; the people hoping to gain some measure of protection by it's presence. During the Second Fire Bringer War, Brass Castle was utilized many times by Zexen troops.
The castle is extremely old, and many of those currently living within it do not know the entirety of the structure. There are many secret passages, including an underground tunnel that connects the castle to an outside wall, and an escape tunnel running from one of the bedrooms in the fortress to outside Brass Castle, via the sewers beneath it.