In the early fifth century in southern Britain, a hero arises - Marcus Aquilius - to protect a Roman town from an invading Saxon army.
Saxon warlord, Cerdric, has landed with a fleet of ships in the former Roman port of Noviomagus (now Chichester) and lays waste to all he sees. They see a well-kept Roman road and know it must lead to a town, and the prospect of plunder. As they make their way to Calleva Atrebates (Silchester) the tribal leader, Vortimer, enlists the aid of young ex-Roman auxilliary cavalry commander, Marcus, to organise their flimsy defences and concoct a strategy to defeat their deadly and merciless enemy.
The townsfolk must decide if their town and way of life is worth fighting for, or if they should flee to the forest and revert to a tribal lifestyle. The pressure builds on Marcus who is embroiled in his search for identity. He knows he must embrace change and makes his own personal journey to emerge as Marcus Pendragon, tribal commander and guardian of the military knowledge of the Roman Legions.