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In page Pope Paul IV:

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Paul IV was violently opposed to the liberal Cardinal Giovanni Morone, whom he strongly suspected of being a hidden Protestant, so much that he had him imprisoned. In order to prevent Morone from succeeding him and imposing what he believed to be his Protestant beliefs on the Church, Pope Paul IV codified the Catholic Law excluding heretics and non-Catholics from receiving or legitimately becoming pope, in the bull Cum ex apostolatus officio.[citation needed]