James Purefoy
Thomas Marshall
Kate Mara
Lady Isabel
Jason Flemyng
Becket
Paul Giamatti
King John
Brian Cox
Albany
Derek Jacobi
Cornhill
Charles Dance
Stephen Langton, Archbishop of Canterbury
Aneurin Barnard
Guy
Jamie Foreman
Coteral
Mackenzie Crook
Marks
Rhys Parry Jones
Wulfstan
Vladimir Kulich
Tiberius
David Melville
Baron Darnay
Annabelle Apsion
Maddy
Steffan Rhodri
Cooper
Daniel O'Meara
Phipps
Bree Condon
Agnes
Guy Siner
Oaks
Marcus Hoyland
Abbott Marcus
John Pierce Jones
Cook
Jeff Jones
Head Clerk
Ceri Mears
Blacksmith
Kenneth Collard
Sapper Captain
Wyn Bowen Harries
Baron
Dewi Williams
Baron
John Weldon
Castle Darney Sentry
Laura Sibbick
Castle Servant Girl
Edward Manning
Mercenary
Simon Nader
Hungarian Mercenaries (voice)
Steve Purbrick
Tavern Landlord
Peter Bartfay
Hungarian Mercenaries (voice) (uncredited)
Dan Burman
Mercenary Scout (uncredited)
Ian M. Court
Priest (uncredited)
David Harkus
Young Soldier (uncredited)
Gerald Royston Horler
Hungarian Warrior (uncredited)
Rhys Horler
Hungarian Warrior (uncredited)
Rhi Louise
Topless Wench (uncredited)
Stuart Mager
Garrison Guard (uncredited)
Christian Morgan
Wounded Guard (uncredited)
Stevie Raine
Mercenary Fight Performer (uncredited)
Carlton Venn
King's Aid 2 (uncredited)