Nearly opposite the church of St. Sebastian is situated the Jewish Catacomb discovered in 1859 in the Vigna Randanini, and already in part described. The principal entrance is an open chamber, originally vaulted, with a floor of black and white mosaic and walls of masonry. A peculiarity in this cemetery is the number of deep graves in the floor capable of containing several bodies, and the number of sarcophagi, some of which are finely carved and gilt. The seven-branched candlestick frequently occurs on the walls and tombs. This Catacomb has been often rifled, and the galleries are strewn with marble fragments of its monuments. Most of the inscriptions have been 189 dug out of this _débris_ and affixed to the adjacent walls. At the other entrance, on the Appian Way, are raised stone seats, intended, it is thought, as resting-places for the bearers of the dead. Not far from this cemetery, but fronting on the Via Ardeatina, is one which De Rossi concludes upon very good evidence to be that of Domitilla, grand niece of the emperor Domitian, of whose banishment and probable martyrdom for the Christian faith we have already spoken. The entrance is an elegant structure of fine brickwork with a cornice of terra cotta, built in the slope of a rising ground and close by the roadside. Connected with the entrance are external chambers, in one of which is a well, which were designed, it is conjectured, for the custodian of the Catacomb, and for the holding of the religious services connected with the burial of the dead and the anniversaries of the martyrs. A spacious vestibule within contains recesses once occupied by several large sarcophagi, fragments of which still remain. The entire roof and walls are covered with the most exquisite arabesques and graceful landscapes, as well as biblical paintings, in the style of the best classic period. It is evidently the monument of a family of wealth and distinction. Connected with this Catacomb is that of Nereus and Achilles, the chamberlains of Domitilla, who suffered martyrdom in the second century. A broad and handsome stairway leads down to the supposed tombs of the martyrs in the lower level of the Catacomb. To facilitate the visits of pilgrims to these shrines the galleries have been widened and lined with masonry, probably by John I., A. D. 523. There are two principal _piani_, in the lower of which is a large chamber paved with marble and lighted by a _luminare_ of unusual size, 190 reaching to the surface of the ground. A large proportion of the inscriptions are Greek, or Latin in Greek characters, which circumstance refers the date of this Catacomb to a period when Greek was still regarded as a sort of sacred and official language of the church.