Philip of Hesse, longstanding leader of the hostile Schmalkaldic
League, had recently contracted a bigamous marriage, causing some
of his former allies to reject him. As a result, he decided to come
to terms with the Emperor Charles V. In the resultant agreement,
Philip undertook to recognise the Archduke Ferdinand, Charles'
brother, as the next emperor, and agreed to abandon his allies in
France and Cleves.
Citation:
Editors. "Philip of Hesse comes to terms with the Emperor Charles V".
The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14651, accessed 23 May 2013.]