When the Saxons, invited to settle in Britannia by King Wyrtgeorn, brutally murder the father and brother of Ceredig, the second son of a fifth century Romano-British chieftain, he flees the land of his birth.

While the Saxons expand their control over Britannia, Ceredig grows up in Armorica, learning the ways of the Gewisse, and ultimately taking command of this elite force of warriors, who had remained loyal to his father, Elisedd.

Despite ruling as a chieftain in Armorica, Ceredig remains determined to return to his homeland, avenge his father and brother's murder, and finally reclaim the lands his father had once ruled in southern Britannia.

After over forty years in exile, Ceredig, his son and a force of Gewisse warriors return to Britannia, joining a large army of Britons who are preparing to take on the Saxons in battle at Badonbyrg.

What happens next will go down in history...