Zeno of Sidon

Zeno of Sidon (; c. 150 – c. 75 BC) was a Greek Epicurean philosopher from the Seleucid city of Sidon. His writings have not survived, but there are some epitomes of his lectures preserved among the writings of his pupil Philodemus.

Life Zeno was born in the city of Sidon. He was a contemporary of Cicero, who heard him when at Athens.

He was sometimes termed the "leading Epicurean." He was a disciple of Apollodorus, and Cicero and Diogenes Laërtius both describe him as an accurate and polished thinker.

Philosophy Zeno held that happiness is not merely dependent upon present enjoyment and prosperity, but also on a reasonable expectation of their continuance and appreciation. and On Anger.

Zeno also studied the philosophy of mathematics based on the derivation of all knowledge from experience. He criticized Euclid, seeking to show that deductions from the fundamental principles of geometry cannot, on their own, be proved: