Egeria is the amphibious Naiad (freshwater nymph) who mentored King Numa Pompilius of Rome (715-673 BCE). After King Numa's death, she went to the Otherworld, & then she returned in the 4th century CE as the Celtic Christian nun Egeria, who wrote an Itinerarium about her travels in the Middle East as a pilgrim. She builds bridges of understanding between Graeco-Roman religion & Christianity, using the Golden Chain of Hermeticism, Orphism, Pythagoreanism, Platonism, & Neoplatonism.