Therumancer said:
The only point I'd question, which is minor in this case, is that I don't think "Blackmoor" was the actual first RPG "campaign setting" despite what a lot of people might think. I think technically Professor M.A.R. Barker (I think that's right) technically beat Gygax and Arnenson to the punch with his Tukemel /Empire Of the Petal Throne. Though the high price of his product prevented it from catching on or overtaking the more popular Gygax/Arnenson works.
There are several related matters to untangle here.
M.A.R. Barker's
Empire of the Petal Throne RPG was published in 1975 by TSR, a year after the release of
D&D and the same year as its Supplement II, entitled
Blackmoor (and credited to Dave Arneson, even though much of its contents were written by others, notably Steve Marsh). EPT's setting of Tekumel was created by Barker decades before and he did play some miniatures wargames campaigns in it, but it didn't become a RPG setting until after Barker had met Arneson and become exposed to
D&D. By that time, Blackmoor, the campaign setting, had already been well under way for several years, predating both Gygax's Greyhawk setting and in fact
D&D itself.