Here are the answers to the following characters, events, and organizations and the role they play in Greyhawk history (as referenced in Canoness Y'Dey's speech to the party in the IC Thread):
1. Canoness Y'Dey of Hommlet
Lawful good servant of St. Cuthbert. Along with Otto, was stationed in Nulb in the First TOEE module. Fought at Emridy Meadows, etc. Slew Lareth the Beautiful (commander of the Moathouse) in the Original TOEE campaign.
2. Battle of Emridy Meadows
Battle where the forces of Furyondy, Veluna, Verbobonc, the Kron Hills, and Celene destroyed the original army of the TOEE.
3. Demon Queen of Fungi
Zuggtmoy, Demoness Lady of Fungi, Ruler of the 222nd plane of the Abyss, imprisoned within the TOEE, banished by the original party that quested through TOEE (Elmo, Otto, Y'Dey, Robilar, Circle of Eight, etc.).
4. Temple of Elemental Evil
Bad guys.
5. Otto
Older brother to Elmo. A Ranger. Knighted by Furyondy and Veluna. One of the Heroes of the Battle of Emridy Meadows. A different Otto from the Wizard in the PHB/circle of Eight.
6. Nulb
Ruined village near the TOEE where bad guys used to gather.
7. Old One/Dark God/Ruler of the Lands in Darkness/Terror of the World
Iuz, ruler of the lands north of Greyhawk. Cambion/Demi-God.
8. St. Cuthbert
Lawful Good God of Retribution. Sometimes thought to be Lawful Neutral, but he really is Lawful Good (kind of like Batman). Came from another plane to save Greyhawk from evil.
9. Robilar
Epic-level fighter (see Epic Level Handbook Greyhawk section) who used to hang around with Mordenkainen and the Circle of Eight. Amoral, only cares for himself. Has looted every major dungeon you have heard of.
10.Circle of Eight
Group of Spell casters trying to make sure the world doesn't fall apart. Alignments in the Good - neutral range.
11.Princes of Elemental Evil
Actually 3 princes and 1 princess. Princess Yan-C-Bin of Air. Prince Imix of Fire. Prin
ce Ogremoch of Earth. Prince Olhydra of Water. Quasi-Divine Powers, the elemental princes are amongst the most powerful elementals in existance (imagine an Elemental Monolith from Complete Arcane with Divine Rank 0). Only the Primal Elementals (in the Epic Level Handbook) are more powerful.
12.Spider Queen/Goddess of the Dark Elves
Lolth or Lloth. Goddess/Demon Queen of the Drow. Ally of Iuz.
13.Six Fingered Demon Prince of Sorcerors/Father of the Old One
Graz'zt, Demon Prince (see Book of Vile Darkness).
14.Immortal Witch that ruled Perrenland a century ago/Mother of the Old One
Iggwilv the Witch and lover of Graz'zt
15.Scarlet Brotherhood
Group of Evil Monks that wish to revive power of the ancient Suel Imperium.
16.Prince Thrommel
Prince Charming and all around nice guy that went missing after he won the Battle of Emridy Meadows. He was supposed to become King of a united Furyondy and Veluna and Verbobonc and all the nearby lands.
17.Seekers/Suel Necromancers
Group of wizards that want to reclaim ancient Suel Secrets.
18. Elder Elemental Eye
Elder Evil. Clerical Domains: four elements, evil.
19. Destroyer of the World/Elder Evil/Banished Beyond Time and Space by the Gods
Tharzidun, another Elder Evil. Clerical Domains: Evil, Madness, Destruction.
20. Canon Hazen and the Crook of Rao/The Flight of the Fiends in the Greyhawk Wars
Highest spiritual leader in Veluna. Used an artifact to drive all fiends (except Iuz) back to the Abyss and Hell during the Greyhawk wars.