The Three Musketeers (1973) and The Four Musketeers (1974)
Director Richard Lester (A Hard Day's Night) and a fantastic cast bring the Alexandre Dumas adventure masterpiece to vivid, vibrant life. A young country minor noble is sent to Paris to enlist in the King of France's elite Musketeers regiment, meets three widely contrasting fellow soldiers, and becomes involved in a court intrigue with international repercussions. This is perhaps the most-real looking portrayal of 17th-century Paris (and its contrasts between the glitter of the gilded court and the squalor of where most of the city's people live) ever committed to film, and the fight scenes are uniformly excellent. There are many great performances here, but the one that stands out is Charlton Heston as Cardinal Richelieu, one of the prime movers of the plot. His ruthlessness is contrasted with the fact that, as far as France's national interests are concerned, he is absolutely right about the Queen.
A note; Lester originally intended to make this as a single, epic film. When studio brass split it into two parts after shooting, the cast rebelled because they had only been paid for one film. In the end, the studio relented and paid them again (they must have been placed under serious pressure from the actor's union in the UK).