Editors. "The German Protestant princes meet at Heilbronn". The Literary Encyclopedia. First published 01 February 2011; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15469, accessed 27 April 2015.]
German Protestant princes, led by Frederick IV of the Palatinate, meet at Heilbronn to oppose the Holy Roman Emperor, Rudolf II.
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