Editors. "John George Duke of Saxony applies to join the Protestant Union". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15808, accessed 19 April 2014.]
John George Duke of Saxony applies for admission to the Protestant Union of German princes. His support is lukewarm, however: despite being a Lutheran himself, he had not joined the Union on its first creation in 1608, and had even supported the candidacy of hardline Catholic Archduke Ferdinand to become King of the Romans.