Richard Harris

King Arthur

Vanessa Redgrave

Guenevere

Franco Nero

Lancelot Du Lac

David Hemmings

Mordred

Lionel Jeffries

King Pellinore

Laurence Naismith

Merlyn

Pierre Olaf

Dap

Estelle Winwood

Lady Clarinda

Gary Marshal

Sir Lionel

Anthony Rogers

Sir Dinadan

Peter Bromilow

Sir Sagramore

Sue Casey

Lady Sybil

Gary Marsh

Tom of Warwick

Nicolas Beauvy

King Arthur as a Boy

Fredric Abbott

Sir Geoffrey (uncredited)