The line of the Via Cornelia, which ran parallel with the north side of the circus, can be traced with precision by the help of the classical, or pagan, tombs discovered at various times along its borders. Let us start from the site of the modern Piazza di S. Pietro. Sante Bartoli, _mem._ 56-57, says that while Pope Alexander VII. was building the left wing of Bernini's portico, and the fountain of the southern semicircle, a tomb was discovered with a bas-relief above the door representing a marriage-scene ("vi era un bellissimo bassorilievo di un matrimonio antico"). On July 19, 1614, three others were found in the _atrium_, in one of which was the sarcophagus of Claudia Hermione, the renowned pantomimist. The best discovery, that of pagan tombs exactly on the line with that of S. Peter's, was made in the presence of Grimaldi, November 9, 1616. "On that day," he says, "I entered a square sepulchral room (10 ft. × 11 ft.), the ceiling of which was ornamented with designs in painted stucco. There was a medallion in the centre, with a figure in high relief. The door opened on the Via Cornelia, which was on the same level. This tomb is located under the seventh step in front of the middle door of the church. I am told that the sarcophagus now used as a fountain, in the court of the Swiss Guards, was discovered at the time of Gregory XIII. in the same place, and that it contained the body of a pagan." [Illustration: PLAN OF OLD S. PETER'S, SHOWING ITS RELATION TO THE CIRCUS OF NERO] We come now to the decisive point, the discoveries made in the time of Urban VIII., when the foundations of his bronze baldacchino were sunk to a great depth, in close proximity to the tomb of S. Peter. The genuineness of the account is proved by the fact that in spite of its great bearing on the question, so little importance was attached to it that, had not Professor Palmieri and Cavaliere Armellini unearthed it from the sacred dust of the Vatican archives, in which it had been buried for three and a half centuries, we should still have been wholly ignorant of its existence.