Plotinus’s editor, vegetarian philosopher, and unrepentant systemizer. Porphyry (c. 234–c. 305 CE) took Neoplatonism and gave it footnotes, logic tables, and a bite of metaphysics with a side of ethics. He defended the soul, attacked the Christians, and made the case for not eating your fellow animals. His Life of Plotinus is a fan letter with philosophy — and his Isagoge shaped medieval logic for centuries. Porphyry didn’t just think — he filed, sorted, and categorized the cosmos.