The Romans come to Britannia with one mission: settle their people and add Britannia to their ever-expanding empire. In first century AD, centurion Quintus Agricolanus travels to Gosbecks. Power-hungry Rome seeks to make Gosbecks a colonia for retiring soldiers but must first clear out its current occupants.
To achieve this, they enter into treaties with local Celtic tribes, but these treaties are heavily slanted toward the Roman government and levy unrealistic taxes on the indigenous people. Beyond the Celts, the Romans must also deal with the Druids of Britannia: religious leaders that act in judicial roles.
The Druids are a serious source of potential problems, so the Romans strive to stamp out this priestly class. However, they do not manage to kill all of them, as some Druids escape to spread word of these horrors. The Romans hope to establish their colony by changing the native people—but will they end up changed instead?