Elona and Palawa Joko?
To quote the wiki:
“For years after the defeat of Varesh Ossa and the fall of Abaddon, Elona was at peace. The Sunspears spread across all three continents, attempting to fulfill their ancient purposes. But the peace they brought was not to last. In their campaign to end the threat of Varesh Ossa and stop Abaddon’s final attempt to free himself from the prison of the gods, the Sunspears also unleashed the architect of their own doom back upon the world—a monster who would bring about the next dark age.
The monster’s name was Palawa Joko. Within sixty years of Kormir’s rise to godhood, Palawa Joko mustered his former power and marched a new army of mummies, zombies, and other undead out of the Crystal Desert into war with Vabbi. To ensure his dominance, Palawa dammed and diverted the river Elon, causing drought and famine amid the northern provinces of Elona and creating a green and growing area within the Crystal Desert. In this area, Palawa Joko established the seat of his new kingdom.
The horrible famine caused by the diverted river caused widespread rebellion among the people of Vabbi and northern Kourna. Palawa Joko then found it all too easy to break the backs of Elonian resistance. Vabbi bowed to his strength simply to survive, and Kourna and Istan both became vassal states.
Palawa’s price for benevolence was tribute, forced loyalty, and all those who bore the name Ossa delivered unto his care. Periodically, a few more descendants were found hiding in the hills of Elona—and all were delivered unto the undead ruler of Elona. From the descendants of his ancient enemy, Palawa created a living army to match his undead one, reveling in the irony that Ossa’s children owed their lives—and their loyalty—to him.
Palawa also took great pride in the destruction of his greatest enemies: the Sunspears. Broken, their strongholds destroyed, their members scattered to the winds, they stood as a force no longer in Elona. Eventually, most of the populace forgot about the Order and their heroic deeds. Those few Sunspears who survived passed on the teachings of the Order over the course of more than a hundred years, holding onto the tenets of a barely-remembered vision. They became wandering mystics, philosophers, and lone warriors in a world that chose to forget their presence.
All but a few. Some Sunspears, taken in by Palawa Joko’s offers of power and rank, abandoned their vows. These traitors to the Order were given command of Palawa’s armies or allowed to work alone against those in Elona who once scorned them. Each one, converted personally by Palawa, was given power over death and sent out to hunt down and destroy their fellow Sunspears—or bring them before their lord to be drawn into their unholy cause. These knights, called the Mordant Crescent, became a dark presence in the sunlit southern lands of Tyria."
Source: http://wiki.guildwars2.com/wiki/Movement_of_the_world
And sure – anything’s possible!
To chime in- that quote isn’t from the wiki, but the very first pre-release article ANet gave us, back in 2007. ANet has, broadly speaking, stuck to it, and in the case of Elona I suggest following the Movement, but there are places where ANet has changed things around, particularly dates. I mention this because there is indication in-game that the date for Palawa Joko’s conquest may have been moved from about 1135 to about 1275 (see Divinity Guide).