(13) After the death of Basilides, Valentinus became the leading inspiration of the Gnostic movement. He still further complicated the system of Gnostic philosophy by adding infinitely to the details. He increased the number of emanations from the Great One (the Abyss) to fifteen pairs and also laid much emphasis on the Virgin Sophia, or Wisdom. In the Books of the Savior, parts of which are commonly known as the Pistis Sophia, may be found much material concerning this strange doctrine of Æons and their strange inhabitants. James Freeman Clarke, in speaking of the doctrines of the Gnostics, says: "These doctrines, strange as they seem to us, had a wide influence in the Christian Church." Many of the theories of the ancient Gnostics, especially those concerning scientific subjects, have been substantiated by modern research. Several sects branched off from the main stem of Gnosticism, such as the Valentinians, the Ophites (serpent worshipers), and the Adamites. After the third century their power waned, and the Gnostics practically vanished from the philosophic world. An effort was made during the Middle Ages to resurrect the principles of Gnosticism, but owing to the destruction of their records the material necessary was not available. Even today there are evidences of Gnostic philosophy in the modern world, but they bear other names and their true origin is not suspected. Many of the Gnostic concepts have actually been incorporated into the dogmas of the Christian Church, and our newer interpretations of Christianity are often along the lines of Gnostic emanationism.