"Once upon a time, in a land that was called Britain, these things happened ... well, maybe," said Cornwell. "'The Warlord Trilogy' is my attempt to tell the story of 'Arthur', 'Rex Quondam Rexque Futurus', the 'Once and Future King', although I doubt he ever was a king. I suspect he was a great warlord of the sixth century. 'Nennius', who was one of the earliest historians to mention Arthur, calls him the 'dux bellorum', the 'leader of battles' or 'warlord'..."
"Post-Roman Britain was a difficult time for the native Britons, being threatened by invasion from the Anglo-Saxons in the East and raids from the Irish in the West.