or **ÆGERIA**, in Roman Mythology, a nymph of Aricia in Italy, from whom Numa is said to have received instructions respecting the laws and regulations which he introduced at Rome. According to the legend, they had frequent interviews by night in the Lucus Camenarum—a grove near the Porta Capena, in the valley now called La Caparella. When Numa died, the disconsolate Egeria retired to the grove of Aricia, on the borders of the Lacus Nemorensis (Nemi); and by her tears and lamentations so frequently interrupted the worship of Diana, that the goddess, in commiseration, transformed her into a fountain. Egeria was regarded as a prophetic divinity; and, as presiding over childbirth, she was invoked by pregnant women. Hence by some she has been identified with Lucina. (Liv. i. 19.; Ovid, Met. xv. 431, &c.; Virg., Æneid, vii. 761), &c.