The year is 412 AD. The Roman legions have all withdrawn from Britannia. The cives and tribes who remain no longer have the might of Rome at their backs or her foot on their throats. They must rally to fill the power vacuum and defend themselves against an array of seaborne enemies attracted by prosperous lands lightly defended. Meanwhile, the Picts of Caledonia seize their opportunity to invade and so begins sixty years of strife for the Britons. This...