Italian-born pope (1881–1963), born Angelo Giuseppe Roncalli, who ascended the papal throne in 1958 and served until his death. As the guiding force behind the historic Second Vatican Council, John ushered in the most sweeping reforms the Catholic church had undergone in centuries. TLS in French, signed “+ Angelo Giuseppe Roncalli,” one page, 8.25 x 10.5, Nonciature Apostolique de France letterhead, October 25, 1947. The future pope writes to author Abbé George Lemaitre. In part (translated): “It has been a long time that I wanted to thank you for the homage you made me in sending an inscribed copy of your book ‘Our Priesthood.’ I know that I am late, but I have the pleasure to say to you today that I read the book with the greatest interest. I congratulate you … and extend the same wishes to his Excellency Monsignor Guerry, and I hope that this book finds its deserving reception from the clergy.” In fine condition, with usual mailing folds, light scattered toning, and a few tiny edge tears. R&R COA.