The World of Greyhawk has a long, tangled history that is tracked by many different cultures' timelines. For ease of reference this page will only focus on the contemporary “common year” calendar abbreviated in most game publications as “CY”. The timeline below is by no means a comprehensive list of Greyhawk canon, and only serves as a framework for our campaign.

• -5515 Suloise Empire founded.

• -2659 Baklunish Empire founded.

• -2150 Flan tribes spread throughout the Flanaess living alongside native demihuman realms.

• -1910 Corrupted Flan kingdom of Sulm conquers all neighbors.

• -903 Sulm falls, land changes into the Bright Desert.

• -485 Beginning of the Baklunish-Suloise Wars.

• -466 First employment of humanoid mercenaries on both sides of the war.

• -458 Driven eastward by warfare, Oeridian migrations reach their peak.

• -447 Suloise migrations begin eastward into the Sheldomar Valley yet beyond here, they find resistance from Flan and Oerid tribes and are eventually driven to the corners of the continent.

• -422 Twin Cataclysms. Suloise Mages of Power unleash the Invoked Devastation on the Baklunish Empire. In response, Baklunish mage-priests counter by cursing the Rain of Colorless Fire down upon the Suloise turning their empire into the Sea of Dust.

• -342 Kingdom of Keoland founded.

• -315 Settlement of Greyhawk established.

• -217 Largest Oeridian tribe in the east founds the Kingdom of Aerdy.

• -110 Battle of a Fortnight’s Length. Aerdi defeat rival Oerid tribe Nehron, united they become the Great Kingdom.

• 1 New common calendar started as universal peace declared by the Aerdian Overking.

• 15 Absorbed by the Great Kingdom, Greyhawk booms from trading post to city.

• 100 Viceroyalty of Ferrond founded to govern the Great Kingdom's western dependencies.

• 109 Battle of Shamblefield. Great Kingdom routs Frost Barbarians at Spinecastle.

• 150 Rhennee first appear in Adri Forest. Unaccepted, they take to barge life on rivers and lakes.

• 254 Ferrond declares independence, becomes the Kingdom of Furyondy.

• 300 Bandit Kingdoms begin to form in the Northern Reaches.

Shield Lands formed as a bulwark against bandit raids.

• 320 Oerid-Baklunish nomads migrate to the northern prairies.

Outer dependencies of the Great Kingdom continue to splinter off.

           Archmage Zagig Yragerne begins construction of Castle Greyhawk.

• 356 Emboldened by lesser nations, the Kingdom of Nyrond secedes from the Great Kingdom. Kingdom of Keoland at its height, absorbing all satellite realms and pushing briefly into Ket.

• 421 Zagig Yragerne disappears; his castle falls into ruin attracting generations of treasure seekers.

• 437 Overking assassinated, Turmoil Between Crowns begins over claims to succession.

• 438 Small War between Furyondy and Keoland ends Keoish expansion north.

• 446 Pirate fleets conquer southern ports on the Azure.

Ruthless Ivid I assumes throne of the Great Kingdom ending the Turmoil.

           Several states break off to form the Iron League in reaction to the new Overking.

• 447 Battle of a Thousand Banners. Iron League defeats South Province at Irongate.

• 461 The Ulek states become autonomous and with Celene sever ties to Keoland.

• 464 Battle of Jetsom Isle. Sea Prince pirates lose to Keoish navy forcing captains to settle down.

• 479 Iuz grows in power as humanoid incursions increase in the north.

• 498 Greyhawk officially declared a free city.

• 505 Iuz disappears without reason leaving his territory in chaos.

• 510 Hateful Wars sparked by murder of elven queen's consort, ends with all humanoids driven out of the Lortmil Mountains.

• 513 Rise of the Horned Society as a result of Iuz's absence.

Humanoids from the Lortmils overrun and take control of the Pomarj peninsula.

• 526 Dyvers secedes from Furyondy to become a free city.

• 563 Bone March falls to humanoids.

• 569 Battle of Emridy Meadows. Allied forces of Good led by Prince Thrommel of Furyondy rout the Horde of Elemental Evil. The Temple of Elemental Evil is then sacked and demon-queen Zuggtmoy is bound within its dungeons.

• 570 Iuz, now a demigod, returns to reclaim his lands.

• 572 Battle of Medegia. Sea Barons decisively defeat the Lordship of the Isles on the Aerdi Sea.

• 573 Scarlet Brotherhood first revealed after centuries of seclusion. Prince Thrommel kidnapped before marriage to Jolene of Veluna, preventing the union of their two nations.

• 576 Savant Sage completes the Guide to the World of Greyhawk.