Clinomachus was a Megarian philosopher from Thurii

Thurii

Thurii , called also by some Latin writers Thurium , for a time also Copia and Copiae, was a city of Magna Graecia, situated on the Tarentine gulf, within a short distance of the site of Sybaris, whose place it may be considered as having taken...

. He is said by Diogenes Laërtius

Diogenes Laertius

Diogenes Laertius was a biographer of the Greek philosophers. Nothing is known about his life, but his surviving Lives and Opinions of Eminent Philosophers is one of the principal surviving sources for the history of Greek philosophy.-Life:Nothing is definitively known about his life...

 to have been the first who composed treatises on the fundamental principles of dialectics, and he is described as the founder of the Dialectical school. According to the Suda

Suda

The Suda or Souda is a massive 10th century Byzantine encyclopedia of the ancient Mediterranean world, formerly attributed to an author called Suidas. It is an encyclopedic lexicon, written in Greek, with 30,000 entries, many drawing from ancient sources that have since been lost, and often...

, he was the disciple of Euclid of Megara

Euclid of Megara

Euclid of Megara was a Greek Socratic philosopher who founded the Megarian school of philosophy. He was a pupil of Socrates in the late 5th century BCE, and was present at his death. He held the supreme good to be one, eternal and unchangeable, and denied the existence of anything contrary to the...

, and he taught Bryson

Bryson of Achaea

Bryson of Achaea was an ancient Greek philosopher.Very little information is known about him. He was said to have been a pupil of Stilpo and Clinomachus, which would mean that he was a philosopher of the Megarian school. He was said to have taught Crates the Cynic, Pyrrho the Skeptic, and...

, the teacher of Pyrrho

Pyrrho

Pyrrho , a Greek philosopher of classical antiquity, is credited as being the first Skeptic philosopher and the inspiration for the school known as Pyrrhonism, founded by Aenesidemus in the 1st century BC.- Life :Pyrrho was from Elis, on the Ionian Sea...

. He thus lived towards the earlier half of the 4th century BC.