The term "gnostikos" may have acquired a deeper significance here. Alexandria was of central importance for the birth of Gnosticism. The Christian "ecclesia" (i. e. congregation, church) was of Jewish–Christian origin, but also attracted Greek members, and various strand of thought were available, such as "Judaic apocalypticism, speculation on divine wisdom, Greek philosophy, and Hellenistic mystery religions." Regarding the angel Christology of some early Christians, Darrell Hannah notes: The pseudepigraphical Christian text "Ascension of Isaiah" identifies Jesus with angel Christology: The Shepherd of Hermas is a Christian literary work considered as canonical scripture by some of the early Church fathers such as Irenaeus. Jesus is identified with angel Christology in parable 5, when the author mentions a Son of God, as a virtuous man filled with a Holy "pre-existent spirit". In the 1880s Gnostic connections with neo-Platonism were proposed. Ugo Bianchi, who organised the Congress of Messina of 1966 on the origins of Gnosticism, also argued for Orphic and Platonic origins. Gnostics borrowed significant ideas and terms from Platonism, using Greek philosophical concepts throughout their text, including such concepts as hypostasis (reality, existence), "ousia" (essence, substance, being), and demiurge (creator God). Both Sethian Gnostics and Valentinian Gnostics seem to have been influenced by Plato, Middle Platonism, and Neo-Pythagoreanism academies or schools of thought. Both schools attempted "an effort towards conciliation, even affiliation" with late antique philosophy, and were rebuffed by some Neoplatonists, including Plotinus. Early research into the origins of Gnosticism proposed Persian origins or influences, spreading to Europe and incorporating Jewish elements. According to Wilhelm Bousset (1865–1920), Gnosticism was a form of Iranian and Mesopotamian syncretism, and Richard August Reitzenstein (1861–1931) most famously situated the origins of Gnosticism in Persia. Carsten Colpe (b. 1929) has analyzed and criticised the Iranian hypothesis of Reitzenstein, showing that many of his hypotheses are untenable. Nevertheless, Geo Widengren (1907–1996) argued for the origin of (Mandaean) Gnosticism in Mazdean (Zoroastrianism) Zurvanism, in conjunction with ideas from the Aramaic Mesopotamian world.