Ken Hughes Director, Screenwriter Richard Harris Oliver Cromwell Actor Alec Guinness King Charles I Actor Robert Morley The Earl of Manchester Actor Dorothy Tutin Queen Henrietta Maria Actor Frank Finlay John Carter Actor Timothy Dalton Prince Rupert Actor Patrick Wymark The Earl of Strafford Actor Patrick Magee Hugh Peters Actor Nigel Stock Sir Edward Hyde Actor Charles Gray The Earl of Essex Actor Michael Jayston Henry Ireton Actor Richard Cornish Oliver Cromwell II Actor Michael Goodliffe Solicitor General Actor Jack Gwillim General Byron Actor Basil Henson Hacker Actor Irving Allen Producer Frank Cordell Original Music Geoffrey Unsworth Cinematographer Bill Lenny Film Editing Maude Spector Casting John Stoll Production Design Herbert Westbrook Art Director Arthur Taksen Set Decoration