Male visitors are admitted through the convent to its large and beautiful _Garden_, which overhangs the steep side of the Cœlian towards the Coliseum, of which there is a fine view between its ancient cypresses. Here, on a site near the monastery, are some remains believed to be those of the temple built by Agrippina (_c._ A.D. 57), daughter of Germanicus, to the honour of her deified husband (and uncle) Claudius, after she had sent him to Olympus by feeding him with poisonous mushrooms. This temple was pulled down by Nero, who wished to efface the memory of his predecessor, on the pretext that it interfered with his Golden House; but was rebuilt under Vespasian. In this garden also is the entrance to the vast substructions known as the _Vivarium_, whence the wild beasts who devoured the early Christian martyrs were frightened by burning tow down a subterranean passage into the arena. The famous Church of SS. Giovanni e Paolo at Venice was founded by emigrants from this convent. The memory of these saints was so much honoured up to the time of Pope Gregory the Great, that the eve of their festival was an obligatory fast. Their fête (June 26) is still kept with great solemnities on the Cœlian, when the railing round their place of execution is wreathed and laden with flowers. When the "station" is held at their church, the apse is illuminated. Continuing to follow the lane up the Cœlian, we reach the richly tinted brick _Arch of Dolabella_, erected, A.D. 10, by the consuls P. Cornelius Dolabella and Caius Julius Silanus. Nero, building his aqueduct to the palace of the Cæsars, made use of this, which already existed, and included it in his line of arches. Above the arch is a _Hermitage_, revered as that where S. Giovanni di Matha lived, and where he died in 1213. Before he came to reside here he had been miraculously brought from Tunis (whither he had gone on a mission) to Ostia, in a boat without helm or sail, in which he knelt without ceasing before the crucifix throughout the whole of his voyage! Passing beneath the gateway, we emerge upon the picturesque irregular Piazza of the Navicella, the central point of the Cœlian, which is surrounded by a most interesting group of buildings, and which contains an isolated fragment of the aqueduct of Nero, dear to artists from its colour. Behind this, under the trees, is the little marble _Navicella_, which is supposed to have been originally a votive offering of a sailor to Jupiter Redux, whose temple stood near this; but which was adapted by Leo X. as a Christian emblem of the Church,--the boat of St. Peter.