The Latin rite of the Catholic Church is today celebrating the feast of St. Robert Bellarmine (1542-1621), a Renaissance Jesuit and cardinal, who most notoriously was one of the Inquisitors who condemned Giordano Bruno to be burned at the stake in 1600 and was involved in the first summoning of Galileo Galilei in 1616 to Rome on orders from Pope Paul V. This summons was not exactly a full-bore “trial.” Rather, Bellarmine wanted to inform Galileo that the Congregation of the Index was about to condemn the heliocentric model of Copernicus by placing this Polish cleric’s famous book On the Revolutions of the Celestial Spheres on the Index of Forbidden Books. Given that upcoming condemnation, Bellarmine told Galileo that Copernican theories could no longer be “defended or held,” although Catholic astronomers could continue to discuss heliocentrism as a mathematical fiction.
On the later election Maffeo Cardinal Barberini as Pope Urban VIII—who was both a friend of Galileo and had opposed Bellarmine’s condemnation of heliocentrism in 1616—Galileo ventured to propose the Copernican model once more in his epochal Dialogue between the Two Chief World Systems of 1632, which itself led, as everyone knows, to his condemnation by the Inquisition a year later, after which he spent the rest of his life under house arrest.

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