Editors. "Conspiracy in France is discovered by Richelieu". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16195, accessed 25 April 2014.]
Henry, Marquis de Cinq-Mars, forms a conspiracy against Cardinal Richelieu. He signs a secret treaty with Spain, but Richelieu uncovers the machinations, leading to the Marquis' execution.