Akalabeth: World of Doom (Apple II)

Hey is that guy teaming up with a mouse? I wonder if my dude gets to have a rodent sidekick.

Yeah, this one's pretty old. In fact it's about as old as they come for RPGs. Akalabeth! World of Doom!! eventually became known as Ultima 0, because it's the immediate predecessor to the legendary Ultima series, also made by Lord British (aka Richard Garriott.) So it's the foundation to one of the foundations of the entire genre.