This digital collection is comprised of digitized letters and formal documents signed by several popes from Gregory XIII to Pius IX. Included are the rare signature of Gregory XIV as pope, an office he only held from 1590-1591, and a bull of Clement XII, 1737 (with seal removed). The donor of the collection, John D. Crimmins, a New York contractor and philanthropist, was a noted collector of books and manuscripts and a trustee of The Catholic University of America.