CATACOMBS OF DOMITILLA.

The tomb at the entrance dates from the reign of Trajan, and contained the remains of SS. Nereus and Achilleus; also of Petronilla, a member of the Aurelii family. The saints were the servants of Domitilla, a daughter or niece of Flavius Clemens, the first of imperial blood who suffered martyrdom. Domitilla opened this tomb, which afterwards became a general catacomb, for the remains of her servants. This is the most ancient Christian catacomb, as may be seen from the paintings and brickwork of the vestibule. The present entrance is modern; the catacomb is interesting for its paintings. In 1874 the