The Dark Castle background from Trials of Mana / Seiken Densetsu 3. It's used in the exterior of the back door area of said dungeon. Like the name says, it would be great for dark / castle levels, in general. This rip was part of my C3 Graphic Ripping Showcase .
It uses palette 3 and 4. Also, it uses BG1, BG2 and a small portion of BG3.