Editors. "Death of Ferdinand IV, King of the Romans". The Literary Encyclopedia. First published 01 April 2011; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16385, accessed 25 April 2015.]
Ferdinand IV, King of the Romans, who was to have succeeded his father as Holy Roman Emperor, dies of smallpox at the age of 30.
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