Zeno of Citium

Zeno of Citium (c. 334 – 262 BCE) was the founder of Stoicism, the school of
philosophy that would dominate the moral imagination of the Greco-Roman world
for half a millennium. Born in Citium, a town of mixed Greek and Phoenician
population on the island of Cyprus, he came to philosophy by way of
shipwreck. A merchant by trade, he is said to have lost a cargo of purple dye
at sea and, washing up in Athens, wandered into a bookseller's shop where he
encountered an account of Socrates. Asking where such men might be found, he
was pointed toward the Cynic philosopher Crates, and his new life began.

After studying with the Cynics and other teachers, Zeno developed his own
system and began to teach in a public colonnade on the edge of the Athenian
agora, the Stoa Poikile or "Painted Porch," from which his followers took the
name Stoics. He taught there for decades, respected by the city to the point
that the Athenians honoured him with a golden crown and a public tomb.

Stoicism as Zeno framed it divided philosophy into three parts: logic,
physics, and ethics. Its physics was a thoroughgoing materialism in which a
rational, fiery principle — the Logos, borrowed in spirit from Heraclitus —
pervades and governs the whole of nature. Everything that happens does so
according to this providential order, so that the cosmos itself is a kind of
living, rational being.

From this followed the celebrated Stoic ethics. Since the universe is
governed by reason, the good life consists in living in agreement with
nature — that is, in accordance with reason and virtue. Virtue alone is good,
vice alone is evil, and everything else — health, wealth, reputation, even
life and death — is "indifferent," neither good nor bad in itself. The wise
person, recognizing what lies within their power and what does not, attains a
freedom from disturbance that no external misfortune can touch.

Zeno's successors, Cleanthes and Chrysippus, systematized and defended his
teaching, and centuries later it found its most famous voices in the Roman
Stoics Seneca, Epictetus, and the emperor Marcus Aurelius. The enduring
appeal of Stoic self-mastery, traced back to the shipwrecked merchant of
Citium, has scarcely diminished with the passing of the ancient world.