Beory 22
Boccob 20
Celestian 22
Ehlonna 20
Erythnul 18
Fharlanghn 19
Heironeous 21
Hextor 20
Kord 14
Incabulos 20
Istus 21
Iuz 20
Nerull 18
Obad-Hai 20
Olidammara 21
Pelor 19
Pholtus 17
Ralishaz 20
Rao 9
St. Cuthbert 22
Tharizdun 16
Trithereon 21
Ulaa 18
Vecna 13
Wee Jas 16
Boccob 20
Celestian 22
Ehlonna 20
Erythnul 18
Fharlanghn 19
Heironeous 21
Hextor 20
Kord 14
Incabulos 20
Istus 21
Iuz 20
Nerull 18
Obad-Hai 20
Olidammara 21
Pelor 19
Pholtus 17
Ralishaz 20
Rao 9
St. Cuthbert 22
Tharizdun 16
Trithereon 21
Ulaa 18
Vecna 13
Wee Jas 16
Vecna was created by Brian Blume, not Gygax, and was not part of the original Greyhawk lore. His original entry was in the 1E DMG that didn't have any setting reference. Reading the histories in the Greyhawk boxed set, there's not a reasonable time period he could have existed after the Twin Cataclysm that fits his lore. They added him in after the fact, with his first Greyhawk mention happening after Gygax was ousted.Um…. Vecna predates all the other settings. The god things is arguable - the Greyhawk part isn’t.