“ He planned the assassination of Cardinal Richelieu at the camp of Amiens in 1636, a plan which failed through the cowardice of Orleans. Montrésor was obliged to spend the next six years on his estate, but in 1642 he entered into the plot of Cinq Mars against Richelieu. On its failure he escaped to England, but his estates were confiscated. Returning after Richelieu’s death, he entered into the intrigues of the period just preceding the Fronde, and was imprisoned in the Bastille, then in Vincennes, having risked his safety by coming back from exile in Holland to aid the duchess of Chevreuse. ”