Sagal's husband Kurt Sutter is also a part of the show, which is slated to begin on March 19 in Wales, reported People.
Sutter is also the creator of the series, which is off drama genre and will tell the story of a warrior knight, played by newcomer Lee Jones, who finds himself weary from the savagery of war but is forced to take up arms once again under King Edward I's charge.
Moyer will be portraying a street-smart and noble savvy, and one of Ventris' former marshals in the army who now, serves as his chamberlain, chancellor and justiciar - and friend and drinking mate.
Sutter is set play the guardian of Annora, The Dark Mute Mate. He speaks rarely and no one's ever seen his face.
Paris Barclay will direct and produce alongside Brian Grazer and Francie Calfo. Airing date has not been announced just yet.
The series' cast includes the likes of Flora Spencer-Longhurst, Sam Spruell, Darren Evans, Danny Sapani, Timothy V Murphy, Sarah White and Sarah Sweeny.
