Leontion (Λεόντιον) was the Athenian Epicurean philosopher of the late 4th c. BCE — a student of Epicurus himself who wrote a famous (now lost) treatise refuting the philosophy of Theophrastus, head of the Lyceum.
Featured in Diogenes Laërtius's Lives of Eminent Philosophers.
Leontion reduces to three — the number of Greek philosophy.