1642: Henri Coiffier de Ruze, Marquis of Cinq-Mars

On this date in 1642, with the last words “Mon Dieu! Qu’est-ce que ce monde?”, 22-year-old former royal favorite Cinq-Mars was beheaded at Lyon’s Place des Terreaux.

Henri Coiffier de Ruze (English Wikipedia page | French) had been under Cardinal Richelieu’s protection since the boy’s father died in 1632; in 1639, the Red Eminence introduced the then-19-year-old whippersnapper to Louis XIII as a prospective royal favorite (read: lover).

Though the king did indeed take to the youth, Cinq-Mars, in the age-old custom of sullen teenagers everywhere, soon found the luxurious profligacy of the favorite’s life rather overbalanced by irritation at both of his sickly, aging patrons.

Tart talk to intimates graduated to something more serious after Richelieu rudely put the kibosh on Cinq-Mars’s (unrealistic) designs on a wealthy noblewoman — which was also a bid to parlay his tenuous favorite gig into some lasting power.

Now considering himself personally begrudged of the Cardinal, Cinq-Mars fell into the conspiracies (French link) to depose, assassinate, or otherwise replace him.

Eventually Cinq-Mars would go so far as a real blockbuster (French again): he signed a secret pact with the Spanish king to support a noble revolt in exchange for handing over French possessions, a seditious plan also backed by perennial plotter Gaston d’Orleans, the king’s scheming brother.

Our angry moppet had more than met his match in Richelieu, however: the cardinal’s agents intercepted (more French) the treasonable correspondence and had Cinq-Mars dispatched this date along with his confederate de Thou.


Execution of Cinq-Mars and De Thou in Paris (1642), engraving by Johann Luyken, Paris, Bibliothèque nationale de France (via)

Richelieu himself was already dying as he undid this last conspiracy against him. The cardinal succumbed on December 4, 1642 … with Louis following him into the grave the next May.

While Richelieu’s name is fixed in the firmament of history and literature, Cinq-Mars has to make do as the namesake of a rarely-seen Gounod opera, based on the 1826 historical novel Cinq-Mars by Alfred de Vigny.

On this day..