Editors. "German Catholic princes sign the defensive League of Nuremberg". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14598, accessed 20 May 2013.]
The German Catholic princes establish a defensive League of Nuremberg, in response to the largely Protestant Schmalkaldic League. The predominant signatories are the Emperor Charles V, Ferdinand of Austria, Duke George of Saxony, the Elector of Bavaria and the Archbishops of Mainz and Salzburg.