Tom Holland as The Novice - Brother Diarmuid

Richard Armitage as Raymond De Merville

Jon Bernthal as The Mute

Stanley Weber as The Cistercian - Brother Gerladus

John Lynch as The Herbalist - Brother Ciaran

Éric Godon as Baron de Merville

Tristan McConnell as Dugald

Rúaidhrí Conroy as Brother Rua

Lochlann Ó Mearáin as Lopsided

Hugh O'Conor as Brother Cathal

Nikos Karathanos as Saint Matthias

Diarmuid de Faoite as The Captain