Stardock today announced the release of The Conquest of Brittania, the first add-on to historical city builder Imperium Romanum. Imperium Romanum: The Conquest of Brittania includes four new missions and a plethora of game updates as the player faces the challenge of conquering the British Isles. Imperium Romanum: The Conquest of Brittania is available for $5.99 or 1 TGN token here.