This work is a classic of Counter-Reformation scholarship--an effort to show that the true church had always been Catholic. The manuscript shows that Carlo Baronio inserted his reference to the forged works of the Egyptian prophet Hermes Trismegistus--a glaring error for which he was chastised by the Protestant Isaac Casaubon--into the text of his church history only after he had composed it in draft. The manuscript, with its many corrections and additions, gives a good sense of the scale of Baronio's enterprise as well as of the occasional weaknesses of his research and criticism of sources.
Vat. lat. 5684 fol. 11 recto arch12 TG.20
Another obelisk, found outside the city on the Appian Way, became the centerpiece of Baroque Rome's most spectacular space--the Piazza Navona. Borromini's lovely but plain design was rejected in favor of the splendid one by Bernini, one of his most astonishing creations.
Vat. lat. 11258 fol. 200 recto arch14 TG.31
Iacopo Mazzocchi's first printed collection of Roman inscriptions was re-used by many scholars as a field notebook. In this copy a Roman scholar gives a firsthand account of how the remains of Augustus's huge sundial were discovered early in the sixteenth century, by a baker digging a latrine. As Pope Julius II had no funds to spare, it was reburied, not to be unearthed until the twentieth century.
Vat. lat. 8492 fol. 21 recto arch15 TG.58