No one should omit seeing the grand picture of _Guido Reni_, over the high altar of this church,--the Crucifixion, seen against a wild, stormy sky. Niccolas Poussin, ob. 1660, is buried here, and one of his best known Arcadian landscapes is reproduced in a bas-relief upon his tomb, which was erected by Chateaubriand, with the epitaph,-- "Parce piis lacrymis, vivit Pussinus in urnâ, Vivus qui dederat, nescius ipse mori. Hîc tamen ipse silet; si vis audire loquentem, Mirum est, in tabulis vivit, et eloquitur." In "The Ring and the Book" of Browning, this church is the scene of Pompilia's baptism and marriage. She is made to say:-- --"This St. Lorenzo seems My own particular place, I always say. I used to wonder, when I stood scarce high As the bed here, what the marble lion meant, Eating the figure of a prostrate man." Here the bodies of her parents are represented as being exposed after the murder: --"beneath the piece Of Master Guido Reni, Christ on Cross, Second to nought observable in Rome." On the left, where the Via della Vite turns out of the Corso, an inscription in the wall records the destruction, in 1665, of the triumphal arch of Marcus Aurelius, which existed here till that time. The magnificence of this arch is attested by the bas-reliefs representing the history of the emperor, which were removed from it, and are preserved on the staircase of the palace of the Conservators. "Les Barbares n'en savaient pas assez et n'avaient pas assez de patience pour démolir les monuments romains; mais, avec les ressources de la science moderne et à la suite d'une administration régulière, on est venu à bout de presque tout ce que le temps avait épargné. Il y'avait, par exemple, au commencement du XVIe. siècle, quatre arcs de triomphe qui n'existent plus; le dernier, celui de Marc Aurele, a été enlevé par le pape Alexandre VII. On lit encore dans le Corso l'inconcevable inscription dans laquelle le pape se vante d'avoir debarrassé la promenade publique de ce monument, qui, vu sa date, devait être d'un beau style."--_Ampère, Voyage Dantesque._ A little further down the Corso, on the left, the Via delle Convertite leads to _S. Sylvestro in Capite_, one of three churches in Rome dedicated to the sainted pope of the time of Constantine. This, like S. Lorenzo, has a fine mediæval campanile. The day of St. Sylvester's death, December 31 (A.D. 335), is kept here with great solemnity, and is celebrated by magnificent musical services. This pope was buried in the cemetery of Priscilla, whence his remains were removed to S. Martino al Monte. The title "In Capite" is given to this church on account of the head of St John Baptist, which it professes to possess, as is narrated by an inscription engrafted into its walls.