Editors. "The Peace of Ferrara". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16224, accessed 22 May 2013.]
The War of Castro, which has been fought since 1641, is ended by the Peace of Ferrara. The conflict had pitted the forces of Pope Urban VIII against those of the Duke of Parma, aided by Venice, Modena and Tuscany.