Created by WGA Award-winning writer Jez Butterworth ("Spectre," "Jerusalem") "Britannia" is set in A.D. 43, when the Romans invaded Britain led by General Aulus Plautius, who is determined to succeed where Julius Caesar failed and conquer this mythical land on the very end of the Roman Empire. Kerra, daughter of the King of the Cantii, is forced to put her differences with archrival Queen Antedia aside in order to unite the tribes and supposedly magical Druids and face their invaders. But General Aulus carries a secret that threatens to undermine the entire mission.