Zeno of Citium (333 BC - 264 BC) was a Stoic philosopher of the Hellenistic period from Citium, Cyprus. He studied under Crates of Thebes, and later founded a Stoic school of philosophy. Although none of Zeno's writings survived, his ideas have been passed down through anecdotes and the work of his students. His ideas influenced many later philosophers, including Seneca, Epictetus & Marcus Aurelius. The most detailed summary of Zeno's life and work is in Diogenes Laërtius’ “The Lives and Opinions of the Eminent Philosophers”.