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Galileo Galilei was among the most notorious figures targeted by the Roman Catholic Inquisition. His fervent advocacy for the theory that all planets, including Earth, orbit the Sun led the Catholic Church to accuse him of heresy, resulting in his confinement under house arrest for the remainder of his life. Galileo understood he was on the Church's radar, and a newly found letter indicates that he once sought to moderate his views to evade persecution, as reported by Nature and Ars Technica.
The letter, dated 1613, unravels a long-standing mystery for scholars of Galileo. It was discovered in the library of the Royal Society, where it has resided for at least 250 years.
Galileo’s conflict with the Catholic Church arose from his endorsement of heliocentrism—the belief that the solar system revolves around the Sun—championed in Nicolaus Copernicus’s work De Revolutionibus. Galileo's scientific publications clearly supported Copernicus’s worldview, including personal letters that circulated widely, where he sometimes challenged the scientific validity of Biblical texts.
In 1613, Galileo corresponded with a friend and former student, Benedetto Castelli, who was teaching mathematics at the University of Pisa. This letter served as an extensive discussion of Galileo’s reflections on Copernicus’s theories and their relationship with religion, contending that science and astronomy should not be dominated by religious beliefs. (He would later elaborate on this in his Letter to the Grand Duchess Christina.) Like many of Galileo's writings during this period, the letter was widely copied and eventually reached the Inquisition in Rome through a friar named Niccolò Lorini in 1615.
This is where matters become complicated. Galileo asserted that the version of the letter sent by Lorini had been altered to provoke stronger reactions. He provided a less contentious version of the letter to a friend, claiming it was the original and should be forwarded to the Vatican to vindicate him. However, scholars have struggled to ascertain the truth of his allegations regarding the letter's alteration.
This newly uncovered letter implies that he may have been dishonest and that he sought to moderate his language to placate the Catholic Church and prevent authorities from suppressing heliocentric concepts. The original document found in the Royal Society archives shows edits in what appears to be Galileo’s handwriting. The seven-page letter, signed “G.G.,” contains revisions such as replacing “false” with the more ambiguous phrase “look different from the truth,” and changing “concealing” to “veiling,” along with other modifications aimed at softening the language that had angered Church officials. The handwriting and wording align with Galileo's style from that period. This discovery suggests that Galileo indeed attempted to make his ideas more acceptable to the Catholic Church in hopes of avoiding persecution by the Inquisition.
The letter, found during a research trip by science historian Salvatore Ricciardo from Italy's University of Bergamo, may have been overlooked in the Royal Society archives due to being cataloged with the date October 21, 1613, instead of its actual date of December 21, 1613. However, the circumstances of its arrival at the Royal Society remain unclear. The document will be the focus of an upcoming article by Ricciardo and his team in the Royal Society journal Notes and Records, as reported by Nature.
The minor adjustments made by Galileo did not prevent the Church’s crackdown on heliocentrism. In 1616, the Inquisition mandated that Galileo cease teaching or defending the theory, leading to the banning of several of his works. Nearly two decades later, in 1633, he faced trial again on charges of heretical beliefs. He was found guilty and sentenced to house arrest, where he lived until his death in 1642.
