The son of Byzantius was Pammachius, the friend and correspondent of S. Jerome. He did something also. He erected a handsome church over the tomb of the saints, and this was completed in 410, forty-eight years after their martyrdom. There had, however, been no break in the tradition, for Byzantius had made his oratory only two or three years later than their martyrdom. The basilica erected by Pammachius consisted of an oblong nave, with side aisles and an apse to the west. To the east end was a quadrangle, surrounded by a cloister, and with a water-tank in the middle. By means of a flight of steps visitors were enabled to descend to the “Confession,” or place whence they could look down on the alabaster box containing the relics of the martyrs in the cellar; and in the angles of the wall below, a triangular white marble table was placed, hollowed out in the middle for oil, in which a wick burned to throw light on the tomb. Hard by, in later years, was the family mansion of S. Gregory the Great, who sent Augustine and his little band, in 597, to convert the Anglo-Saxons of Kent. Now, Gregory knew well this church of SS. John and Paul, and often prayed there. Somewhere about 603 he sent a present to Queen Theodelinda, the Bavarian Princess, who had married Agilulph, the Lombard, and among other things some of the oil from this very lamp. This identical vial of oil is preserved among the treasures of Monza, along with some little gold hens and chickens presented by Theodelinda. Now, a few years ago, Padre Germano, a Passionist father of the monastery attached to the church, in studying the blank south wall of the church that rises out of the little lane, the Clivus Scauri, by which one mounts to reach the entrance of the church, observed that it consisted of a whole series of blocked-up arches and windows above them. In a word, it looked like a three-storey shop-front, or factory of brick, with the openings filled in. What could be the meaning of this? Such an arrangement was not suitable to the basilica of Pammachius, and had certainly no significance for the Church of Adrian I. Then, all at once, it flashed on him what it really was: it was nothing more nor less than the street-front of the palace of John and Paul, which had been solidly built, and consequently had been utilised first by Pammachius and then by Adrian I. Now the church is built at the top of a steep slope, and the level of the floor of the church is far above the arches. It next occurred to the Padre: Is it not possible that the old house of the martyrs may be beneath the floor of this church?