[4] The show was the first co-production between Sky UK and Amazon Prime Video and stars Kelly Reilly, David Morrissey, Zoë Wanamaker, Mackenzie Crook, Nikolaj Lie Kaas, and Eleanor Worthington Cox.

An experienced warrior, Aulus establishes a fortified camp, gathers information from captives, even children, and learns that the Druids are the driving force behind the many tribes he faces.

Divis roams the countryside seeking clues to the meaning of his apocalyptic visions, and believes he is on some kind of mysterious "mission".

Yet, King Pellenor makes no preparations to resist the Romans, other than relying on vague hints from the Druids to set policy.

Kerra ambitiously takes her own steps to address the Roman threat, calling for a parley and venturing into Regni territory.

Her actions enrage her father, who sends her to be judged by the Druids, and possibly flayed alive, as happened to her mother.

The first series was produced by Rick McCallum, Vertigo Films and Neal Street Productions and shot on location in Czech Republic and Wales.

[19] In 2024, Deadline reported that British writer Benjamin Crushcov filed suit against Sky and the series' executive producers, claiming that Britannia was based on his spec project Tribus, and seeking damages (approx.

The review aggregator website Rotten Tomatoes reported a 76% approval rating, with an average rating of 6.54/10 based on 37 reviews, with site's critics consensus saying: "Brilliantly bonkers, Britannia's duplicitous characters and campy fantasy won't be for everyone, but those looking for less-serious swords and sorcery may enjoy its spellbinding madness.