Guest Stars Arnas Fedaravicius as Sihtric James Northcote as Aldhelm Millie Brady as Aethelflaed Toby Regbo as Aethelred Adrian Bouchet as Steapa Christian Hillborg as Erik Magnus Samuelsson as Clapa Björn Bengtsson as Sigefrid Ole Christoffer Ertvaag as Sven Anthony Cozens as Aidan Jóhannes Haukur Jóhannesson as Sverri Christopher Sciueref as Jonis Kenneth M. Christensen as Hakka David Gant as Ceolwulf Tina Gray as Abbess Catherine Kohl as Nun