Cleanthes
Greek Stoic philosopher and boxer (3rd-century BC)
- Lived
- 330 BC–231 BC
- Country
- Assos
Updated September 2026
About Cleanthes
Cleanthes, of Assos, was a Greek Stoic philosopher and boxer who was the successor to Zeno of Citium as the second head (scholarch) of the Stoic school in Athens. Originally a boxer, he came to Athens where he took up philosophy, listening to Zeno's lectures. He supported himself by working as a water-carrier at night. After the death of Zeno, c. 262 BC, he became the head of the school, a post he held for the next 32 years. Cleanthes successfully preserved and developed Zeno's doctrines. He originated new ideas in Stoic physics, and developed Stoicism in accordance with the principles of materialism and pantheism. Among the fragments of Cleanthes' writings which have come down to us, the largest is a Hymn to Zeus. His pupil was Chrysippus who became one of the most important Stoic thinkers.
Biography from Wikipedia, CC BY-SA 4.0. Photo via Wikimedia Commons.
Sources: book lists and dates from Wikidata and Open Library, ratings from Open Library readers. Last updated September 2026.