Editors. "Pope Paul IV advocates the deposition of all sovereigns who support heresy". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14968, accessed 08 December 2013.]
Pope Paul IV issues the bull Cum Ex Apostolatus, which recommends and endorses the deposition of any sovereign who supports heresy. This includes Protestant monarchs such as Elizabeth I of England.