303.[316] She is frequently represented in art; sometimes, in allusion to her 194 name, with a lamb as her attribute. Indeed, after Christ and the Apostles, no figure is more common.[317] The den of infamy in which she was exposed to shame became changed to the Christian sanctuary of _S. Agnese in Piazza Navone_, one of the most beautiful churches in Rome. A subterranean cell of peculiar sanctity is said to have been the scene of her degradation and deliverance. She was buried in a garden a mile from the city, and Constantia, the daughter of Constantine, having been healed at her tomb of a dangerous malady, that prince erected over her body the church of _S. Agnese fuori le Mura_, which is one of the least altered and most beautiful examples of the imperial basilicas. A long flight of stairs, whose walls are covered with inscriptions from the adjacent Catacombs, leads down to the church, which was constructed on a level with the reputed tomb of the saint.[318] Many noble Roman families chose the place of their sepulture near the tomb of so illustrious a martyr. Constantia herself was there interred, 195 and soon after two other daughters of Constantine, Helena, the wife of Julian, and Constantina, the wife of Gallus. Having died, the former at Vienne in Gaul, the latter at the extremity of Bithynia, they were brought from the west and the east to rejoin their sister sleeping near this celebrated saint. This region became, in fact, the fashionable cemetery of the great during the fourth century; as is still evident from the superior regularity and spaciousness of the corridors, and the more laboured execution although inferior style of the paintings. Thus was formed in course of time the vast Catacomb of St. Agnes. [Illustration: Fig. 30.--Entrance to the Catacomb of St. Agnes.]