During the late 16th century,
Catholics and Protestant
Huguenots are fighting over political control of France, which is ruled by the neurotic,
hypochondriac King
Charles IX, and his mother,
Catherine de' Medici, a scheming power player. Catherine decides to make an overture of goodwill by offering up her daughter
Margot in marriage to
Henri de Bourbon, a prominent Huguenot and
King of Navarre. She wants to diplomatically spare the sensibilities of
Pope Gregory XIII and Spain on the one hand, and the Protestant states on the other, and above all appease the hatred and rivalries within the kingdom between the Catholic party of Duke Henri de Guise (
Miguel Bosé) and the Protestant faction led by
Admiral Gaspard de Coligny (Jean-Claude Brialy). Soon after, she schemes to bring about the notorious
St. Bartholomew's Day Massacre of 1572, when thousands of Protestants are slaughtered. The marriage goes forward but Margot, who does not love Henri, begins a passionate affair with the soldier
La Môle, also a Protestant from a well-to-do family. Murders by poisoning follow, as court intrigues multiply and Queen Catherine's villainous plotting to place her son the Duke of Anjou on the throne threatens the lives of La Môle, Margot and Henri of Navarre. A book with pages painted with
arsenic is intended for Henri but instead causes the slow, agonizing death of King Charles. Henri escapes to Navarre and sends La Môle to fetch Margot, but Guise apprehends him. La Môle is beheaded in the
Bastille before Margot can save him, and King Charles finally dies. Margot escapes carrying La Môle's embalmed head as Anjou is proclaimed King of France as
Henry III. ==Cast==