The Three Musketeers, 1973. Stars Michael York as d'Artagnan, Oliver Reed as Athos, Frank Finlay as Porthos / O'Reilly and Richard Chamberlain as Aramis. Directed by Richard Lester and written by George MacDonald Fraser. It was originally proposed in the 1960s as a vehicle for The Beatles, whom Lester had directed in two other films.
Plenty other stars in this film too including Fay Dunnaway, Raquel Welch, Christopher Lee and Simon Ward to name a few.