Thuria is a fictional supercontinent created by Robert E. Howard which first appeared in "The Shadow King", the first of his King Kull stories which was published in 1929 in Weird Tales. It is the setting for the his King Kull stories and the background history for the Hyborian Age of his widely more successful Conan the Barbarian stories. It likewise starred in the King Kull line of comics published by Marvel Comics. In both Marvel Comics and the Conan: Adventures in an Age Undreamed Of roleplaying game of Modiphius Entertainment, the Mythos is involved in its history.
Before the Thurian Age
10s of thousands of years ago, elder monstrous races ruled the land. In the land that would become Valusia, the Serpent Folk established an empire. Till the elder races were overthrown and for the most part exterminated by the rising race of man, who would go on to establish their own kingdoms, those of the Thurian Age.
Over 20,000 years ago, on the Thurian super continent were seven great empires dominated most of the continent, of which the western empire of Valusia was the greatest. To the west of them was the small continent of Atlantis, and to the west of the Atlanteans were the Pictish Islands. On the eastern shore of the Thurian supercontinent was a human empire ruled by non-Thurians, a people who came from a continent far to the east across the sea. East of that empire were the large islands of Lemuria. South of the Thurian continent was a mysterious human civilization.
From the island continent of Atlantis, a barbarian who would start out as a pirate and then become a mercenary within the Valusian army would seize the decadent throne of Valusia. His name was known as Kull the Conqueror, and he not only revitalized the Valusian kingdom but crushed the last remnants of the Serpent Folk in those lands and it was thought he wiped them out.
Circa 20,000 BC, a great cataclysm devastated the world. Atlantis and Lemuria sunk beneath the waves. Parts of the Thurian supercontinent sunk or vanished under the waves, forming great inland seas and lakes. The Pictish islands were thrust up forming the mountains of a new continent. Cities were toppled and nations wiped out by earthquakes, volcanoes, and flooding.
On the Thurian coast was an Atlantean colony to which surviving Atlantean refugees fled to in their ships. A great colony of Picts had survived untouched on Valusia's south. Many Lemurians made it to the eastern Thurian shores only to be enslaved by the non-Thurian empire and kept in servitude for 1000s of years. In the west, the remnant kingdoms of the Picts and Atlanteans waged war against each other and within 500 years reverted back to barbarism. To the southeast, a remnant of a non-Valusian civilization, survived as Zhemri. Further to the south, the lands are still dominated by pre-human races. A lesser cataclysm soon followed which completed the ruin of the barbarians and created a great inland sea dividing the west and east of the continent.
In the west, the descendants of the Picts and Atlanteans have been reduced to a primitive stone age state. In the east, the descendants of the Lemurians have risen up and overthrown their masters, and like savages they stalked the ruins of a strange civilization. The former masters fled westward, where they would establish two mighty empires. In the lands along the river Styx, they overthrew a pre-human race, and established the kingdom of Stygia. To the north of Stygia, they established the empire of Acheron. The empire of Acheron would become the greatest power in the western world, a kingdom ruled by dark sorcerers. Further north a barbarian tribe was rising to primacy, the warlike tawny-haired fair-skinned Hybori which slowly treks southward. 1,500 years after the lesser cataclysm, the Hyborians tribes have conquered or destroyed weaker tribes to the south and west of them. To the north, the first Hyborian civilization has emerged, the kingdom of Hyperborea. The Hyborian barbarians would end up coming under the yoke of the empire of Acheron, and would eventually rise up against their overlords and overthrow Acheron.
To the west of the Hyborians, the ape-like Atlanteans are beginning their long climb up from savagery. The Picts neither progressed nor retrogressed, as they remained savages. Far to the south lies the mysterious ancient kingdom of Stygia. On their eastern shores were nomadic clans, known as the Sons of Shem. To the southeast of the Hyborians the ancient people of Zhemir have rebuilt their civilization, establishing the kingdom of Zamora. To the southwest the kingdom of Zingara will emerge from the mixing of various peoples, the original natives, their Pictish conqueror, and the Hyborian conquerors of the Picts. Far to the east, the Lemurians are building their own civilization on the wreckage of the one they destroyed, the civilization of Khitai.