On the Mysteries of the Egyptians, Chaldeans, and Assyrians

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Neoplatonism
Reconstructed bust believed to represent Plotinus
Concepts Theory of forms Form of the Good Hypostasis Arche Nous Demiurge Logos Anima mundi Henosis Theurgy Okhema Microcosm and macrocosm
Works Enneads De Mysteriis Aegyptiorum Liber de Causis The City of God The Consolation of Philosophy De Coelesti Hierarchia De divisione naturae Chaldean Oracles
People Plotinus (students) Porphyry Iamblichus Julian the Apostate Hypatia Macrobius Augustine of Hippo Proclus Pseudo-Dionysius Simplicius of Cilicia Boethius David the Invincible Maximus the Confessor Johannes Scotus Eriugena Al-Farabi Brethren of Purity Solomon ibn Gabirol Isaac the Blind Michael Psellos Thierry of Chartres Gemistus Pletho Marsilio Ficino Giovanni Pico della Mirandola Giordano Bruno Cambridge Platonists Thomas Taylor Roman Ingarden
Related topics Platonism (in the Renaissance) Platonic Academy Middle Platonism Kabbalah Spirituality Isma'ilism Druze Allegorical interpretations of Plato Plato's unwritten doctrines Neoplatonism and Christianity / Gnosticism
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On the Mysteries of the Egyptians, Chaldeans, and Assyrians (Ancient Greek: Περὶ τῶν Αἰγυπτίων μυστηρίων), also known as the Theurgia and under its abbreviated Latin title De Mysteriis Aegyptiorum (On the Egyptian Mysteries; or often simply De Mysteriis), is a work of Neoplatonic philosophy primarily concerned with ritual and theurgy and attributed to Iamblichus.

Porphyry is known to have had a disagreement with Iamblichus over the practice of theurgy, and the Mysteries consists mainly of Iamblichus' responses to the criticisms of his teacher.