Richard Garriott’s Akalabeth was first released in 1979 for the Apple II home computer (and shortly afterwards for PC MS-DOS), and is arguably the first ever graphical Role-Playing Game ever released.
Sure: Akalabeth: World of Doom doesn’t look like much, but you have to remember that this game was made in 1979, and this is pre-Ultima Garriott, and in many respects this is the prototype of that famous series of RPGs made by Lord British for Origin Systems, and as a result cements its place in gaming history as a first.