Full-page advertisement for module T1 "The Village of Hommlet" appearing in The Dragon #s 31-32 (November-December, 1979)
Gygax’ son and a friend were starting to play, so Gary used the Hommlet campaign as a new, low level adventure for them, distinguishing it from the high level Greyhawk play. Gygax was busy developing TSR products and the Greyhawk Supplement (I) had come out for the Original Rules.
The Hommlet campaign was different than the Greyhawk dungeon delves. There was a village, with a smithy, an inn, a local elder, set in a rural environment. The party could role play in the village then move on to the dungeons of the Temple. It’s possible that Gygax ran players through some iterations of Hommlet and the Temple in late 1975 and into 1976.
*Byrne's article provides a comprehensive overview of the original Temple of Elemental Evil campaign, and is well worth a read. (There are also links to several other articles on Black Gate regarding the Village of Hommlet and Temple of Elemental Evil).
Siege of Bodenburg:
The first Gen Con was held back in 1968, where Gygax played The Siege of Bodenburg, a medieval miniatures wargame. He subsequently used Bodenburg Castle to represent the ruined upper works of Greyhawk Castle, as well as the floorplan of the moathouse in module T1.
Schematic for Bodenburg Castle (left) and the map for the ruined moathouse from module T1 "The Village of Hommlet" (right).
The destruction of the moathouse as recounted in "The Village of Hommlet" was apparently based on the Siege of Bodenburg, and has been recreated as a Chainmail scenario "The Battle for the Moathouse" by Paul Stormberg.
The Temple of Elemental Evil:
T1 was re-released in 1981 as a color version, with new front and back cover art, although the promised T2 "The Temple of Elemental Evil" wasn't forthcoming.
After finishing T1, Gygax was approached by Brian Blume to write a replacement module for the Holmes Basic Set, which became B2 "The Keep on the Borderlands". (Had Blume not done so, I wonder if Gygax would have instead written T2 "The Temple of Elemental Evil"?)
Without T2, I've posted elsewhere that B2 works well as a sequel to T1. One could even continue with WG4 "The Forgotten Temple of Tharizdun" as a Gygaxian trilogy of sorts.
Painting by Clyde Caldwell depicting the ruined moathouse, used for the cover of AC5 "Player Character Record Sheets" (1984)
The AC5 cover painting was actually the first cover I did after coming on staff at TSR. It was done for another module called "The Moathouse". The publication of "The Moathouse" was delayed for some reason and the cover painting was sidelined for a while. I don't know if "The Moathouse" module was ever published, but I think not. The painting was picked up for AC5 since it showed a variety of generic characters. My title for the painting is still "The Moathouse".
Clyde Caldwell, 2010
Sequels and Derivative Works:
Gygax's original manuscript for "The Temple of Elemental Evil" was ultimately completed by Frank Mentzer and published as T1-4 "The Temple of Elemental Evil" (1985), which I ran for my friends during our senior year in high school.
A novelization of the adventure "The Temple of Elemental Evil" by Thomas M. Reid was published in 2001, as part of the "Greyhawk Classics" series.
A sequel for 3e "Return to the Temple of Elemental Evil" by Monte Cook was released in 2001, set 15 years after the original adventure.
The Temple of Elemental Evil was also developed as a video game by Atari, in 2003.
Hackmaster published "The Temple of Existential Evil" by Brian Jelke in 2003.
"Return to the Moathouse" by Mike Mearls was released at the Origins Game Fair in 2008, and a 4e conversion of "The Village of Hommlet" by Andy Collins was published in 2009, and republished in Dungeon #212 (March, 2013).
Dragon #423 (May, 2013) included a "tavern profile" on the Inn of the Welcome Wench by Shawn Merwin, and Dragon #425 (July, 2013) featured articles on the history of "The Temple of Elemental Evil" by Skip Williams, and "The Anatomy of Elemental Evil" by Thomas M. Reid.
See also Jason B. Thompson's walkthrough map.
A "Dungeons & Dragons: Temple of Elemental Evil Board Game" was released by Wizards of the Coast in 2015.
Finally, a two-volume homage and 5e conversion was just released by Goodman Games as Original Adventures Reincarnated #6 (be sure to check out the recently posted unboxing video for a sneak peak at the contents).
The Deed of Paksenarrion:
It has been pointed out that "Divided Allegiance" (1988), the second book in "The Deed of Paksenarrion" by Elizabeth Moon contains many parallels to T1 "The Village of Hommlet" (as discussed in this post from The Mule Abides blog)