The Hyborian Age by Robert E. Howard

Of that epoch known by the Nemedian chroniclers as the Pre-Cataclysmic Age, little is known except the latter part, and that is veiled in the mists of legendry. Known history begins with the waning of the Pre-Cataclysmic civilization, dominated by the kingdoms of Kamelia, Valusia, Verulia, Grondar, Thule and Commoria. These peoples spoke a similar language, arguing a common origin. There were other kingdoms, equally civilized, but inhabited by different, and apparently older races.

The barbarians of that age were the Picts, who lived on islands far out on the western ocean; the Atlanteans, who dwelt on a small continent between the Pictish Islands and the main, or Thurian Continent; and the Lemurians, who inhabited a chain of large islands in the eastern hemisphere.