In the bull 'Zelo Domus Dei', Pope Innocent X condemns the Peace of
Westphalia. It declares that some clauses of it are disadvantageous
to the Catholic religion, since it grants local rulers the power to
make Calvinism the established religion of their state.
Citation:
Editors. "Pope Innocent X condemns Peace of Westphalia".
The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16324, accessed 25 May 2013.]