For clarity of explanation, the
Ultima series was an MS-DOS/Apple IIc/Amiga-era (earlier, if you count
Akalabeth: Realm of Doom) series of RPGs stretching from the 1981 to the mid-1990s, published by Origin and Electronic Arts and written and designed mostly by Richard Garriott (
Lord British).
Ultima VI: The False Prophet was one of the very first PC games I played on my brother's computer, sometime between 1990 and 1992.
Wolfenstein 3-D I also played on that computer, although it was a much different genera of game than the
Ultima series.
https://en.wikipedia.org/wiki/Ultima_(series)