Trivia

Sir John Gielgud was booked to play a major extended cameo, but dropped out.

The Broadway production of "Luther" written by playwright John Osborne opened at the St. James Theater in New York on September 25, 1963, ran for two hundred eleven performances and won the 1964 Tony Award for the Best Play.

After completing The New Centurions (1972), Director Richard Fleischer and George C. Scott planned this movie as their next project. Instead, it was made by Guy Green with their Centurions co-star Stacy Keach playing the title role.

Julian Glover created the part of the Knight in the original stage production.

Matthew Guinness (Reading Monk) is the son of Sir Alec Guinness.