In his exile Clement received into the Church more than two hundred Christians who had been waiting for baptism, and miraculously discovered water for their support in a barren rock, to which he was directed by a Lamb, in whose form he recognised the guidance of the Son of God. The enthusiasm which these marvels excited led Trajan to send executioners, by whom he was tied to an anchor and thrown into the sea. But his disciples, kneeling on the shore, prayed that his relics might be given up to them, when the waves retired, and disclosed a marble chapel, built by unearthly hands--over the tomb of the saint. From the Chersonese the remains of St. Clement were brought back to Rome by St. Cyril, the Apostle of the Slavonians, who, dying here himself, was buried by his side. CHAPTER VIII. THE AVENTINE. Jewish Burial-ground--Sta. Sabina--S. Alessio--The Priorato--Sta. Prisca--The Vigna dei Gesuiti--S. Sabba--Sta. Balbina. The Aventine, which is perhaps the highest, and now--from its coronet of convents--the most picturesque of all the Roman hills, is of irregular form, and is divided into two parts by a valley; one side, the higher, is crowned by the churches of Sta. Sabina, S. Alessio, and the Priorato, which together form "the Capitol of the Aventine;" the other, known as the Pseudo-Aventine, is marked by the churches of S. Sabba and Sta. Balbina. Virgil and Ovid allude repeatedly to the thick woods which once clothed the Aventine.[169] Dionysius speaks of the laurels or bays, an indigenous tree of ancient Rome, which grew there in abundance. Only one side of the hill, that towards the Tiber, now shows any of the natural cliff, but it was once remarkable for its rocks, and the Pseudo-Aventine obtained the name of Saxum from a huge solitary mass of stone which surmounted it. "Est moles nativa; loco res nomina fecit Appellant Saxum: pars bona mentis ea est."[170] The upper portion of the hill is of volcanic formation, and it is supposed that the legend of Cacus vomiting forth flames from his cave on the side of the Aventine had its origin in noxious sulphuric vapours emitted by the soil, as is still the case at the Solfatara on the way to Tivoli. The demi-god Faunus, who had an oracle at the Solfatara, had also an oracle on this hill.[171]