In the Thirty Years War, the German city of Heidelberg is forced to
surrender to the Imperial army. James I sends diplomat Endymion
Porter to Spain, with the aim of encouraging Philip IV to persuade
Emperor Ferdinand II that Heidelberg should be restored to the
Elector Palatine within 70 days, but this mission achieves nothing.
Citation:
Editors. "Heidelberg surrenders to the imperialists".
The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15893, accessed 19 June 2013.]