Kleanthes

Cleanthes, of Assos, was a Greek Stoic philosopher and boxer who was the successor to Zeno of Citium as the second head 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.