Roman Britain, 208 AD - Emperor Septimius Severus has arrived in Britain to conquer the barbarians in the north of the island. Memnon, an African scout, comes to Britain with his cavalry unit. When he saves the life of a beautiful young attendant of the Empress, he becomes aware of tensions within the imperial house. The bitter war tests them all to the limit, and if any of them are to survive, it can only be through their friendship.