Editors. "Rudolf II summons the Imperial Diet to Ratisbon". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15459, accessed 26 May 2013.]
Holy Roman Emperor Rudolf II summons the Imperial Diet to Ratisbon, to vote funds to support renewed warfare against the Ottoman Turks. In this conflict, the Empire has the aid of an ally, Sigmund Bathory, Prince of Transylvania.