UPDATE, 8.12 a.m. PT:Leo Legrand has been added to the cast.
He will play Williams cowardly half-brother, who must be kept on a leash.
Gunnarsson plays fearsome Viking warrior Hardrada and Sigurdsson is Fitzosbern, replacing Joseph Mawle.
Clockwise from top left: Elander Moore, Sveinn Olafur Gunnarsson, Indy Lewis, Jason Forbes, Ines H Asserson, Ingvar SigurdssonPhil Sharp; Johanna H. Thorkelsdottir; Rachel Nolan; Faye Thomas; YellowBelly; Ari Magg
Production has completed in Iceland, with the series set for BBC One and BBC iPlayer in the UK.
Paramount Global Content Distribution distributes outside of UK and Ireland.
Ed Clarke and Coster-Waldau are also EPs.
We firstreported on itback in November.
