Editors. "Charles V and Pope Leo X sign a secret treaty". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14277, accessed 24 May 2013.]
A secret treaty is signed between Holy Roman Emperor Charles V and Pope Leo X, by which they plan to drive the French out of Milan and to extirpate what they see as heresy.