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Zeno of Citium

c. 334–262 BCE

A first way ina deliberate simplification – the portrait says more

Live in harmony with nature and reason, accept what you cannot change, and virtue alone will make you happy.

Placement

Hellenistic, Roman & Late Antique · West Asia & North Africa · Ethics, Logic, Metaphysics

Founded the Stoa in Athens’ “Painted Porch”: living in harmony with rational nature.

Key ideas

  • Logos as world reason
  • Living according to nature

Teachers: Crates of Thebes

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Influence

Influenced by 4

  • Heraclitus

    influenced by

    Zeno took up Heraclitus’ cosmic fire and logos for Stoic physics: a designing fire runs through the world and periodically consumes it; Cleanthes wrote on Heraclitus. Diogenes Laertius VII.134–142, VII.174; A. A. Long, ‘Heraclitus and Stoicism’, Philosophia 5–6 (1975–76); SEP “Heraclitus”

    Evidence: also in InPhO · InPhO

    Heraclitus › c. 535–475 BCE

  • Socrates

    influenced by ✓

    Zeno is said to have turned to philosophy after reading Xenophon’s Memorabilia II in an Athens bookshop; Stoic ethics took up Socrates’ view that virtue is knowledge. Diogenes Laertius VII.2–3; SEP “Stoicism”

    Evidence: also in Wikidata · Wikidata

    Socrates › 470–399 BCE

  • Diogenes of Sinope

    influenced by

    Through his teacher Crates, Zeno took up Diogenes’ Cynic ethics; his Republic, without temples, courts or coinage, was said to be written ‘on the dog’s tail’. Diogenes Laertius VII.2–4, VII.32–33; SEP “Stoicism”

    Evidence: AI draft

    Diogenes of Sinope › c. 412–323 BCE

  • Crates of Thebes studied with

    studied with later tradition

    Known from later tradition (Diogenes Laertius 7.2–4, with the legendary bookshop story); a lost ‘Memoirs of Crates’ listed among Zeno’s works (7.4) and his Cynic-leaning Republic make a real connection plausible. Diogenes Laertius 7.2–4; SEP “Zeno of Citium”

    Evidence: AI draft

    Crates of Thebes › c. 365–285 BCE

Influenced 4

  • Chrysippus

    influenced

    Chrysippus defended and systematised the Stoicism founded by Zeno, especially its logic and theory of knowledge; hence the saying ‘without Chrysippus there would be no Stoa’. Diogenes Laertius VII.179–183; IEP “Chrysippus”; SEP “Stoicism”

    Evidence: also in InPhO · InPhO

    Chrysippus › c. 279–206 BCE

  • Cicero

    influenced

    Cicero set out Zeno’s Stoic ethics in De finibus III and, following Antiochus, argued in book IV that Zeno had changed words rather than doctrines (45 BCE). Cicero, De finibus III–IV; Academica I.35–42; SEP “Cicero”

    Evidence: AI draft

    Cicero › 106–43 BCE

  • Seneca

    influenced

    Seneca took up the Stoic ethics founded by Zeno – virtue the only good, life in agreement with nature – but found Zeno’s compressed syllogisms unpersuasive (Letters 82–83). Seneca, Epistulae morales 82–83; SEP “Seneca”

    Evidence: also in InPhO · InPhO

    Seneca › c. 4 BCE – 65 CE

  • Martha Nussbaum

    influenced

    Nussbaum traced cosmopolitanism to the Stoics, citing Plutarch’s report of Zeno’s Republic, in which all humans are fellow citizens (‘Kant and Stoic Cosmopolitanism’, 1997). M. C. Nussbaum, “Kant and Stoic Cosmopolitanism”, Journal of Political Philosophy 5 (1997); The Cosmopolitan Tradition (2019); Plutarch, De Alexandri fortuna I

    Evidence: AI draft

    Martha Nussbaum › b. 1947

Criticism

Criticized by 1

  • Arcesilaus

    criticised by

    Arcesilaus denied Zeno’s ‘kataleptic’ impression, since a false impression could always look the same, and concluded that the wise should suspend assent. Cicero, Academica II.77; Sextus Empiricus, Adversus mathematicos VII.150–158; SEP “Arcesilaus”

    Evidence: AI draft

    Arcesilaus › c. 316–241 BCE

Position

Zeno founded Stoicism, which divided philosophy into logic, physics and ethics. The cosmos, he taught, is a rational whole permeated by a divine logos; to live well is to “live in agreement with nature”, which means living according to reason. Only virtue is truly good and only vice truly bad; health, wealth and reputation are “indifferent”, though some are preferable to others. Passions such as fear and craving arise from false judgements and are to be overcome. His Republic sketched an ideal community of the wise without temples or law courts. Developed by Chrysippus, Stoicism became one of the most widely held philosophies of the Hellenistic and Roman world.

Life & context

Zeno came from Citium in Cyprus and, according to tradition, turned to philosophy after a shipwreck brought him to Athens. He studied with the Cynic Crates and other teachers, then around 300 BCE began teaching in the Stoa Poikile, the Painted Porch on the agora, which gave the Stoic school its name. His writings survive only in fragments.

Main works

  • Republic (lost, c. 300 BCE)
  • On Life According to Nature (lost, c. 300 BCE)

Sources: Wikipedia · Wikidata

As of November 2026 · Sources · Improve this page · How Agora is made

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