[Henri Coiffier de Ruzé, marquis de CINQ-MARS (1620-1642), a favorite of Louis XIII, was condemned to death for conspiring against Richelieu]. Nouvelle à la main, Lyon 16 septembre 1642; 3pages in-fol. (small tear at bottom of page). Account of the trial and execution of Cinq-Mars and de Thou. In his deposition, Monsieur declared that "Mons. le Grand [Cinq-Mars] had solicited him to make a liaison with him & Mons. de Bouillon & to deal with Spain [...] Fontraille was chosen to go to Madrid", but he broke the treaty as soon as he learned of Cinq-Mars' arrest. When questioned, M. de Bouillon admitted to having taken part in this treaty, although he had not approved it. Interrogation of Cinq-Mars, who began by denying, but finally, "put on the spot in the Presidial Chamber of Lion, he ingenuously confessed his liaison with Mons[ieur] & Mons. de Bouillon & the treaty made with Spain on which he was condemned". De Thou acted as intermediary between them, and the latter confessed that he had also been aware of the treaty but had not discovered it "for fear of being oppressed by the three accomplices", etc. The condemned showed courage in the face of death: De Thou "died a true Christian & a man of courage" and Cinq-Mars "resolved to die with admirable coldness and a constancy of Christian devotion". Attached is a L.A.S. from Cinq-Mars's father, Antoine Coiffier de Ruzé marquis d'EFFIAT (1581-1632), May 29, asking his correspondent to accept M. Coiffier's apologies (1p. in-4).