Editors. "The ruler of Transylvania is assassinated by imperialists". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14825, accessed 23 May 2013.]
The imperialist party in Transylvania, who want the throne to be taken by Archduke Ferdinand, assassinate the current head of government, Cardinal George Martinuzzi, the chief minister of King John Zapolya's son and widow, John John Sigismund and Isabella.