Editors. "Cardinal Mazarin signs treaty with the Duke of Modena". The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16307, accessed 17 April 2014.]
Cardinal Jules Mazarin, chief minister of France, signs a treaty with the Duke of Modena arranging a joint invasion of Milan.