Holy Roman Emperor Ferdinand II elevates his military commander,
Wallenstein, to the title of Duke of Mecklenburg.
Citation:
Editors. "Wallenstein is created Duke of Mecklenburg".
The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15997, accessed 25 May 2013.]