412 – 485
Proclus (412–485 CE) was a Greek Neoplatonist philosopher and the last major head of the Platonic Academy in Athens. A systematic thinker of extraordinary range, he synthesized centuries of Platonic, Aristotelian, and Pythagorean thought into a unified metaphysical architecture centered on hierarchical emanation and reversion. His works profoundly shaped medieval philosophy in both the Islamic and Christian traditions.
Authored the Elements of Theology, the most systematic exposition of Neoplatonist metaphysics in antiquity
Developed the triadic structure of remaining, procession, and reversion (monē, proodos, epistrophē) as a universal metaphysical principle
Wrote the Platonic Theology, synthesizing all of Plato's dialogues into a unified theological system
Produced major commentaries on Plato's Timaeus, Parmenides, and Republic that shaped later interpretive traditions
Influenced medieval scholasticism through the Liber de Causis, a Latin adaptation of his Elements drawn upon by Aquinas