Editors. "Further secret treaty between the Empire and Spain". The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17299, accessed 18 April 2014.]
Spain and the Holy Roman Empire sign a further secret treaty, which arranges marriages between the two royal families and provides for their respective shares of captured French territory in the event of war.