All dates use the Common Year (CY) reckoning established by the Great Kingdom of Aerdy.

-484 CY

• Beginning of the Baklunish-Suloise Wars
  
  

-421 CY

• Twin Cataclysms. Suloise Mages of Power call down the Invoked Devastation upon the Baklunish Empire creating the Dry Steppes. In retaliation, Baklunish spellcasters bring down the Rain of Colorless Fire upon the Suel Imperium, transforming the empire in the Sea of Dust.
• Surviving Baklunish migrate north to the shores of the Dramidj Ocean.
  
  

-216 CY

• Foundation of the Kingdom of Aerdy.
  
  

-110 CY

• Battle of a Fortnight's Length. The Kingdom of Aerdy defeats Nyrond cavalry squadrons to become the regional superpower. Aerdy thereafter becomes known as the Great Kingdom.
  
  

1 CY

• The Common Year is established as the system of reckoning by Grand Prince Nasran I of the Great Kingdom of Aerdy in 645 OR (1 CY), when he declares universal peace throughout his the land, and takes the title of Overking. At this stage the borders of the Great Kingdom extend all the way to the City of Greyhawk.
  
  

320 CY

• Outer dependencies of Aerdy gain sovereignty. Perranland, Veluna, Furyondy, and Tenh each establish independence in a series of minor but bloody wars.
  
  

348 CY

• Keoish King Tavish II made the Wealsun Proclamation, asserting the manifest destiny of Keoland to rule over the entire Sheldomar Valley and its borders.
  
  

354 CY

• The Trantherian Empire is founded near the Hellfurnaces
  
  

355 CY

• Keoland invades Ket and Veluna, but is later forced out.
  
  

356 CY

• Invasion of northern barbarians into North Province prevents the Great Kingdom from retributive action against Nyrond.
  
• Kingdom of Keoland at peak
  
  

361 CY

• Celene declares its independence from Keoland due to the latter's war-like leaders.
• Trantherian Empire invades Keoland
• Celene defeats Keoland in a number of short engagements.
  
  

376 CY

• The Great Kingdom defeats the Trantherian Empire, marking the beginning of their rule of the entire Flanaess
  
  

393 CY

• The Great Kingdom returns rule of the continent to respective nations
  
• Kingdom of Nyrond established when junior branch of Aerdy House Rax-Nyrond declares itself independent of Great Kingdom rule.
  
• Theocracy of the Pale and Urnst also secede from Great Kingdom
  
  

395 CY

• The Reckoning shatters the Lu Shin Empire
  
  

400 CY

• Clan Asati, the first of the half-elf clans, is founded in Celene
  
  

426 CY

• Prince Ivid is crowned Overking of Aerdy
  
  

436 CY

• The University of Rauxes is sacked, and nearly all of its vast library lost or destroyed
  
  

438 CY

• Keoland and Furyondy go to war, resulting in the secession of the Keolandish regions of Gran March, Bissel and the Yeomanry.
  
  

446 CY

• Excessive taxation and repression leads to a general rebellion in the southern Great Kingdom. This event leads to the foundation of the Iron League.
  
• Rise of the Sea Princes
  
• Assassination of nearly all of the House of Rax. Ivid I who accedes to Malachite Throne
  
  

450 CY

• The County of Urnst gains independence from Nyrond at the Council of Rel Mord
  
  

455 CY

• Sunndi joins the Iron League
  
  

461 CY

• The Ulek states gain full autonomy from Keoland
  
  

466 CY

• Iuz the Evil comes to power in the north-central Flanaess
  
  

492 CY

• Iuz’s influence diminished as he is imprisoned by the mad Archmage Zagig Yragerne
  
  

498 CY

• Celene begins the Hateful Wars against the humanoids of the Lortmils
  
  

510 CY

• The Hateful Wars end. The Lortmils are all but emptied of humanoids, and those few that survived the purges flee to the Pomarj. Hobgoblins fared better than most, and retreated to the Wild Coast in better order.
  
  

556 CY

• The Battle of Emridy Meadows occurs, where the Temple of Elemental Evil is sacked and good finally seems poised to triumph over evil
  
  

557 CY

• Iuz returns to power, apparently escaping from his prison and absorbing a demigod’s powers in the process
  
  

569 CY

• Vatun (actually Iuz in disguise) united the northern barbarians and invaded Tenh, which fell in less than two weeks. This is widely considered the start of the Greyhawk Wars
  
  

572 CY

• The Year of Peace
  
  

575 CY

• The Gryphons adventuring group succeeds in the year-long effort to liberate Geoff from giant rule
  
  

576 CY

• Furyondy and Veluna merge into one nation
  
  

578 CY

• The Gryphons succeed in the year-long effort to liberate Sterich from giant rule
  
  

581 CY

• Sesla Ludan founded
  
  

586 CY

• The Circle of Eight is mysteriously wiped out.
• The Gryphons succeed in their five-year campaign to destroy Iuz and free the lands under his brutal control
  
  

588 CY

• The Black Dragons adventuring group founded
  
  

589 CY

• The Drow Invasion begins.
• The Hochlian States (including Narwell, Hardby, and Greyhawk) founded by an alliance between hobgoblins seceding from the Pomarj and the elves of Celene. Greyhawk joins shortly later.
• The Mage Assassinations spread to all types of spellcasters. Lolth is destroyed
  
  

617 CY

• Keoland begins the re-conquest of lands held by Drow
• King Skotti of Keoland issues an ultimatum to Sesla Ludan demanding their assistance in conquering the Drow. Sesla Ludan refuses.
• Keoland declares war on Sesla Ludan
  
  

620 CY

• Keoland surrenders to Sesla Ludan
  
  

626 CY

• After years of war with other nations, Ratikrad remains the last Drow surface nation on the continent
  
  

629 CY

• Songhold is attacked and destroyed by Hugo Orinator and Trantherian Empire forces.
• The Good War between Furyondi-Veluna and Trantheria begins.
  
  

630 CY

• The leadership of Ratikrad is eliminated in a raid by gold dragons and their allies, though new leadership quickly steps in to the void.
• Rinloru is vaporized during a demonic invasion.
• Aksana, Chancellor of the Trantherian Empire is killed in a coup, causing confusion in Sesla Ludan.
• Damasc founded in the Dry Steppes.
• Keoish forces desert the Good War en masse, and Keoland declares independence.
• The Good War ends with the surrender of the Trantherian Empire.
  
  

631 CY

• North Kingdom attempts to push into Bantan without success.
• Internal conflicts cause Sesla Ludan to abandon the Hold of Sea Princes.
• The Trantherian Civil War begins.
• Nyrond declares Tenh independent and establishes a government framework for the new nobility.
• The Furyondi-Veluna economy falls into massive recession.
  
  

632 CY

• Ahlissa makes political and economic moves to bring the Solnor Compact into the Kingdom.
• North Kingdom fractures into independent principalities when a High Priest of Hextor claims the throne. Ratikrad uses the distraction to launch a preemptive strike into Bantan, but spectacular failure causes Ratikhill to fall instead.
  
  

633 CY

• Drow explorers discover entrances to the Underdark in the Rakers, and much of the population in Ratikrad flees before Bantan humanoids overrun the country.
• The Pentarad Half-Elf clan is established in Sesla Ludan.
• Southern Keoland splits from the North in the absence of strong leadership.
• Reports of massive slave uprisings in the Scarlet Brotherhood begin reaching Sunndi. The chaotic Sea Princes region becomes a haven for pirates once again, making Jeklea Bay all the more dangerous for south Keoland, Ulek, and Hochlian traders.
  
  

634 CY

• North Keoland splits into three separate principalities as the leadership is ineffective at governing the reduced nation.
• Sterich declares independence from Sesla Ludan.
• Ratikrad falls to humanoids from Bantan, though the large majority of the Drow have relocated to the Underdark, the Solnor Compact, or the lawless lands to the north.
• The Sea Barons unveil the frigate class of vessel, equipped with light and heavy bombard and an armored hull.
• Several countries confirm that the Scarlet Brotherhood has fallen under massive and widespread slave revolts.
• Piracy explodes into the south Solnor Ocean and the Azure Sea, and trade with Hepmonaland and the Amedio Jungle becomes very sporadic.
• Blackmoor collapses into anarchy, leaving the small population nearly defenseless against the annual barbarian autumn raids.
• Sunndi begins courting the Solnor Compact for membership and inclusion, which occurs before the end of the year.
  
  

635 CY

• Celene secedes from the Hochlian States, but still retains close ties, and takes strides to ensure elves in Hochlian lands do not abandon their homes.
• A majority of the Elves of Lendore migrate to Sunndi, as religious fanaticism grips those staying on the islands.