Britannia is a British-American historical fantasy series written by Jez Butterworth. The nine-part series is the first co-production between Sky and Amazon Prime Video and stars Kelly Reilly, David Morrissey, Zoë Wanamaker, Liana Cornell, and Stanley Weber. It aired on Sky Atlantic in the UK beginning 18 January 2018 and on Amazon Prime Video in the US beginning 26 January 2018.

Synopsis
Set in AD 43, the series follows the Roman conquest of Britain — "a mysterious land ruled by wild warrior women and powerful druids who can channel the powerful forces of the underworld." Celtic rivals Kerra and Antedia must work together to fight off the Roman invasion led by Aulus Plautius.