Wikipedia
In the World of Greyhawk campaign setting for the Dungeons & Dragons roleplaying game, the Suloise, also known as the "Suel," are one of the major races of humans inhabiting the Flanaess.
The Suel began migrating to the Flanaess in large numbers c. -447 CY, from the Suel Imperium. The numbers of the Suloise Migration increased dramatically after the Invoked Devastation and the Rain of Colorless Fire in -422 CY. The Suel settled in many regions of the Flanaess, often competing with the native Flan and migrant Oeridians, as well as non-human inhabitants such as the elves and dwarves.
Though people of Suel descent can be found nearly anywhere in the Flanaess, notable lands that contain a significant number of Suel include the Thillonrian Peninsula, the Scarlet Brotherhood, the Lordship of the Isles, the Sea Barons, the Sheldomar Valley, and the Urnst States. The Lendore Isles was once home to a large contingent of Suel, but most humans have been expelled from that land since the cult of Sehanine Moonbow gained control after the Greyhawk Wars.