Editors. "Leaders of the Schmalkaldic League outlawed by the Empire". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14738, accessed 19 April 2014.]
John Frederick of Saxony and Philip, Landgrave of Hesse, leaders of the Schmalkaldic League, receive the ban of the Empire from Emperor Charles V.