_The Cemetery of Prætextatus_ is on the left hand of the Via Appia, almost parallel with the usual entrance to the vast network of the Catacomb of Callistus. It is, comparatively speaking, a cemetery of small dimensions, but of great antiquity. It must have been arranged quite early in the second century; not improbably portions of this cemetery date from the first century. Some of the decorations of the historic crypt are elaborate and striking, and evidently belong to the best period of classical art. As yet it has only partially been explored. It runs under private property, and the owner apparently is unwilling to allow a detailed examination: this is disappointing, as owing to its great antiquity and possessing some historic crypts, once the resting-places of famous heroes in the early Christian combat, probably discoveries of high interest would result from a prolonged and careful search. As early as A.D. 1857 De Rossi discovered in this cemetery of Prætextatus some crypts highly decorated, evidently the resting-places of certain famous martyrs referred to in the Pilgrim Itineraries as sleeping in this catacomb. There are many indications that we meet with here which tell us that this is a very ancient cemetery. Speaking of this catacomb of Prætextatus, the pilgrim itineraries mention particularly three of those small Basilicas in the immediate vicinity, which frequently in the fourth or fifth centuries were built directly over the crypt or crypts which contained the remains of well-known martyrs and confessors; this was for the convenience of pilgrims who came after from distant countries to pray at the shrines: the ruins of two of these Basilicas, apparently dedicated to SS. Valerian, Tiburtius, Maximus, and Zeno, have been discovered here. Of these confessors, Valerian and Tiburtius were respectively the husband and brother-in-law of S. Cecilia. Zeno[127] was also a martyr. Maximus was the Roman officer who had charge of the execution of Valerian and Tiburtius, and who, seeing their constancy under torture, became a Christian, and was in consequence put to death. Other historic crypts have been ascertained to have existed in this little catacomb--namely, those of SS. Felicissimus, Agapetus, and Quirinus, with his daughter Balbina--of whom Felicissimus and Agapitus were deacons in attendance upon Pope Sixtus. They suffered martyrdom under Valerian, A.D. 258. Quirinus was a tribune who was put to death at an earlier period under the Emperor Hadrian. A yet more famous confessor than any of these, S. Januarius, the eldest of the seven martyr-sons of S. Felicitas, was buried in this sacred second-century catacomb of Prætextatus. The number of graffiti, the work of pilgrim visitors in the neighbourhood of the tomb of this Januarius, bears witness to the great veneration in which this martyr was held.