Copernicus Nicolaus Copernicus circulated for scholarly discussion his hypothesis of a cosmos that was heliocentric and an Earth that rotated around its own axis, first, in 1514 in a manuscript essay, "" (Brief Commentary on the Hypotheses of Heavenly Movements), and then more robustly in the book
De revolutionibus orbium coelestium (
On the Revolutions of the Heavenly Spheres), in 1543. The book was dedicated to
Pope Paul III, who was known for his interests in
astronomy. Both works were known in Rome, and neither attracted adverse theological responses in the sixteenth century. Some seven decades following Copernicus's death, specialists in mathematics, philosophy, and Catholic theology, whom the Roman Inquisition consulted in response to complaints made against
Galileo in 1616, judged the proposition that the
sun is immobile and
at the center of the universe and that the
Earth moves around it, to be "foolish and absurd in philosophy" and that the first was "formally heretical" while the second was "at least erroneous in faith". While the Inquisition refrained from condemning either Copernicus or his book (or Galileo) on the basis of this assessment, several theological claims in
De revolutionibus were ordered to be excised in future publications. Unexpurgated versions of
On the Revolutions of the Heavenly Spheres were placed on the
Index Librorum Prohibitorum (Index of Forbidden Books).
Galileo Galileo Galilei revised the Copernican theories and was admonished for his views on
heliocentrism in 1615. The Roman Inquisition concluded that his theory could only be supported as a possibility, not as an established fact. Galileo later defended his views in
Dialogue Concerning the Two Chief World Systems (1632), which attacked Pope
Urban VIII and thus alienated him and the
Jesuits, who had both supported Galileo up until that point.
John Bargrave 17th century English traveler and author,
John Bargrave, gave an account of his interactions with the Roman Inquisition. Arriving in the city of
Reggio (having travelled from
Modena), Bargrave was stopped by the
city guard who inspected his books on suspicion some may have been on the
Index Librorum Prohibitorum. Bargrave was brought before the city's chief
inquisitor who suggested they converse in
Latin rather than
Italian so that the guards might be prevented from understanding them. The inquisitor told him that the inquisition were not accustomed to stopping visitors or travellers unless someone had suggested they do so (Bargrave suspected that
Jesuits in Rome had made accusations against him). Nonetheless, Bargrave was told he was required to hold a
license from the inquisition. Even with a license, Bargrave was prohibited from carrying any books "printed at any heretical city, as
Geneva,
Amsterdam,
Leyden, London, or the like". The friar
Fulgenzio Manfredi, who had preached against the pope, was tried by the Inquisition and executed in 1610. The Inquisition also concerned itself with the
Benandanti in the
Friuli region, but considered them a lesser danger than the
Protestant Reformation and only handed out light sentences. ==Inquisition in Italy and Malta==