Zeno of Citium 334 BC – 262 BC

Zeno of Citium was a Greek philosopher of Phoenician descent and the founder of Stoicism. After surviving a shipwreck on the voyage to Athens around 312 BC, he became a student of the Cynic Crates and went on to teach in the Stoa Poikile, from which the school takes its name. His ethics held that virtue is the only good and that human flourishing consists in living in agreement with nature, which he identified with reason. Although his writings are lost, his system was developed by Cleanthes and Chrysippus and became one of the dominant philosophies of the Hellenistic and Roman worlds.

Zeno of Citium was born around 334 BC in Citium, a Phoenician-Greek trading city on Cyprus. According to ancient biographers he came to Athens after surviving a shipwreck, encountered the writings of Socrates in a bookseller's shop, and attached himself first to Crates the Cynic and then to Stilpo of Megara and the Academic Polemo, absorbing the ethical rigor of one tradition and the dialectical training of the others.

Around 300 BC Zeno began teaching in the Stoa Poikile — the painted colonnade in the Athenian agora — from which his school took its name. He left no surviving works, but the titles preserved by Diogenes Laertius and the fragments quoted by later authors show a comprehensive system covering logic, physics, and ethics, including the early and controversial Republic in which he sketched a city of the wise. His pupils Cleanthes and Chrysippus carried the school forward and gave the system its mature form.

Zeno's distinctive doctrines — that virtue alone is good, that the passions are mistaken judgments to be extirpated rather than moderated, that the cosmos is a single rational whole governed by logos, and that human beings live well by aligning their assent with nature — set the frame within which Stoicism would develop for the next five centuries. He died around 262 BC and was honored by the Athenians with a public burial in the Kerameikos.