Anthony Quinn was appearing on Broadway in "Becket" (as King Henry II) when he was approached to appear in this film. Producer Dino De Laurentiis had to buy up his Broadway contract to secure his release from the play - something Quinn was anxious for him to do, as he greatly disliked his co-star, Laurence Olivier. After Quinn had departed, Olivier continued in the play, but took over Quinn's part instead of continuing in the title role.