Cum ex apostolatus officio
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Cum ex Apostolatus Officio is the name of a papal bull issued by Pope Paul IV on February 15, 1559, as a codification or explicitation of the ancient Catholic law that only Catholics can be elected Popes, to the exclusion of non-Catholics, including former Catholics who have become public and manifest heretics.
Occult heretics can, however, lawfully become Pope.
The immediate provocation was Pope Paul's suspicion that Cardinal Morone who was popular and expected to succeed him, was a secret Protestant. Pope Paul IV believed it necessary to prevent or negate Morone's possible election as his successor.
Most version of Cum Ex Apostolatus Officio omit a key phrase towards the beginning of Paragraph 6. A complete version can be found at www.vaticaninexile.com/downloads/CumEx.pdf
