Zeno of Citium
Hellenistic · Europe · 334 to 262 BCE
Founder of the Stoic school in Athens, who taught that virtue is the only real good.
What it is
Zeno of Citium was a Greek thinker from the city of Citium on Cyprus who founded the school of philosophy called Stoicism in Athens, around 300 BCE. The school is named after the painted porch, the Stoa Poikile, where he taught.
He came to philosophy through the Cynic Crates of Thebes and built on Cynic ideas, teaching that goodness and peace of mind come from a life of virtue. None of his own books survive except in fragments quoted by later Stoics and their critics, so his thought is known mostly through the school he started.
The main ideas
- Virtue and peace of mind. The Stoic school he began taught that goodness and calm come from living a life of virtue, and that things like pleasure and pain are matters to treat with indifference.
- Three parts to philosophy. He is credited with dividing philosophy into logic, physics and ethics, with ethics as the centre.
- A school in public. He taught at the Stoa Poikile in Athens, and the school took its name from the place.
What it looks like in practice
Picture someone stuck in a long delay at an airport, angry at what they cannot change. A Stoic of Zeno's school would ask them to treat the delay as something outside their control and to put their effort into how they act within it. This is an illustration of the school's approach, not a saying of Zeno.
Books and moments
- The Republic is the best-known work attributed to him, and only fragments of it survive.
- Cleanthes and Chrysippus were the next heads of the school. Chrysippus developed his teaching further.
Questions and criticism
- What did he teach, and what did his followers add? Because his writings are lost, it is hard to separate what Zeno taught from what later Stoics developed.
- Is indifference to pleasure and pain wise? Teachers of this school ask us to be indifferent to many things most people care about, and it is still debated whether that is a strength or a loss.
- Is virtue alone enough for a good life? The Stoics said yes. Aristotle held that a good life also needs some outside goods such as health and friends, and the disagreement is still alive.
Close neighbours
Stoicism grew from Cynicism, and Zeno's follower Epictetus and the emperor Marcus Aurelius carried it forward. The pages on Stoicism, Cynicism and Epictetus show the school he started.
Written by epchē in our own words, and checked against independent sources on 9 October 2026. The sources are listed below.
Philosophies they belong to or are close to
Who they connect to
Influenced
- Chrysippus · He took over the Stoic school after Cleanthes and worked out its system.
- Cleanthes · He studied under Zeno of Citium for years and succeeded him as head of the school.
Other Hellenistic thinkers
- Antisthenes · 445 to 365 BCE
- Diogenes of Sinope · 412 to 323 BCE
- Crates of Thebes · 365 to 285 BCE
- Pyrrho of Elis · 360 to 270 BCE
- Epicurus · 341 to 270 BCE
- Cleanthes · 331 to 232 BCE
- Chrysippus · 279 to 206 BCE
- Carneades · 214 to 129 BCE
- Cicero · 106 to 43 BCE
- Lucretius · 99 to 55 BCE
Sources we used
- Stoicism · Internet Encyclopedia of Philosophy, read on 9 October 2026
- Zeno of Citium · New World Encyclopedia, read on 9 October 2026
- Zeno of Citium · Wikipedia, read on 9 October 2026