After 300 years of existence the Great Kingdom is at its height. From the Solnor Ocean in the east all the way to the Yatils in the west and from Sunndi in the south to the marches in the north such as Blackmoor. The kingdom has become vast and hard to keep together without adventuresome knights. There is plenty of old hostilities and new ones in the making.
203 CY sees the powerful Knight Protectors of the Great Kingdom shaken by the treachery of Sir Kargoth and his thirteen knightly conspirators. They become the first death knights.
213 CY is the official start of Aerdy's decline, the so-called "Age of Great Sorrow" where Aerdian rule becomes weak regarding its outer dependencies. This sets up the drama to unfold for any campaign centered on knighthoods and nobility. Over the next 40-150 years the Great Kingdom begins to chip away starting with the far away Viceroyalty of Ferrond which eventually splits off in 254 CY. Here is the home of the Knights of the Hart (Furyondy, Veluna and Highfolk) who will later see the Kingdom of Keoland's Knights of the Watch inch up on their borders. Another more contemporary rival to the Hart however is the Knights of Holy Shielding whose lands lay between Ferrond (later Furyondy) and the rest of the kingdom in the east.
As you can see from the map below (by Kwint from the Canonfire forums) this is almost the same Flanaess we're used to except it is from a time before the rise of Iuz in the north and the revelation of the Scarlet Brotherhood in the south. The centrally located Greyhawk City is also here albeit as a smaller mining-trade town, not yet free of the Aerdy. It is also a time before the creation of Castle Greyhawk, but there is still many more ancient adventure sites in abundance.
The red areas show the scope of the campaign, where knights have to travel long distances to administer their laws, attend court, participate in tourneys or push the frontiers of the kingdom farther. Divide player character knights between different orders and across this extensive area and the intrigue is only heightened. I will be sure to discuss more on this subject in the future.