Editors. "Henry IV of France signs an alliance with the German Protestant Union". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15672, accessed 24 May 2013.]
Henry IV of France signs an alliance with the German Protestant Union, created in 1608, and prepares to intervene in German politics. His chief minister, the Duke of Sully, credits him with a grand design for European federation to secure peace and end Habsburg dominance.