Spirit of Excalibur is a strategy-adventure game created by Synergistic Software and published by Virgin Mastertronic. it was released in 1990 for the Amiga, Atari ST, MS-DOS, Macintosh, and later ported to Apple IIgs.
The title uses the game engine called World Builder, which we have already seen in War in Middle Earth. Virgin would use this engine again in Conan: The Cimmerian or in Vengeance of Excalibur, the sequel of Spirit of Excalibur.