Presumably the 80s, at least; I know that’s when I played it.
I’m trying to figure out the name of this old thing, and since I don’t have a 5 1/4" drive in my computer anymore I can’t go back to my old store of disks (which we still have, for some reasons) to check.
I remember that there was a decently-sized city you could head through, and I vaguely remember it having a faintly Arabian feel (though I could be hallucinating that). There was also at least one dungeon with several levels, possibly with several entrances inside. I remember clearly that there were stirges, which were phenomenally irritating but also unusual in D&D-style computer games of the 80s.
I know that the graphics were the bright sickly yellow of CGA. I think it had a similar UI structure to Bard’s Tale, but I believe you did not have a party – it was just you against the dungeon.
Okay, that one I remember. I was addicted to my brother’s copy of it but screwed myself when I accidentally saved with no weapons or armor and never finished. What was that one?