Synopsis
The plot faithfully follows the external events of the failed revolt of the French nobility against Richelieu's consolidation of power, but adds a secret love affair between Cinq-Mars and a princess. Whereas de Vigny's character yearned to become her social equal, the opera's hero enters politics only on learning of a planned marriage between Marie and the king of Poland. After the conspiracy is discovered, she is given a chance to save him by agreeing to the match, but her sacrifice is in vain: before their escape plans can be put into effect, the hour of execution is suddenly moved forward.
Read more about this topic: Cinq-Mars (opera)