The Free Cities of the South is a loose alliance of city states that stand together to protect their vast wealth and commercial interests.
The northernmost free city is Feyburn which was visited by the party in a previous campaign.
During the Invasion of Rubia the Free Cities refused to fight with their ally Rubia, instead they surrendered to the Minthras Imperium to avoid bloodshed (with the exception of Feyburn that was under the protection of the dragon Rhaegos).
Once the main invading force was destroyed at the battle of Oringrad, fearing open revolt, the remaining imperial forces were ordered to abandon the Upper Free Cities and secure the richer Lower Free Cities around the Golden Bay. Not much later the Upper Free Cities regained their independence and renewed their alliance with Rubia.