Robert Leadam Eddison , OBE ( 10 June 1908 -- 14 December 1991 ) was an English actor , who is probably most widely remembered in the role of the Grail Knight in `` Indiana Jones and the Last Crusade '' .
Robert Leadam Eddison OBE ( June 10 , 1908 -- December 14 , 1991 ) was a British actor who was known for his role as the Grail Knight in `` Indiana Jones and the Last Crusade '' .