320 BC deaths

Menaechmus (, c. 380 – c. 320 BC) was an ancient Greek mathematician, geometer and philosopher born in Alopeconnesus or Prokonnesos in the Thracian Chersonese, who was known for his friendship with the renowned philosopher Plato and for his apparent discovery of conic sections and his solution to the then-long-standing problem of doubling the cube using the parabola and hyperbola.

Zoilus ( Zoilos; c. 400320 BC) was a Greek grammarian and literary critic from Amphipolis in Eastern Macedonia, then known as Thrace. He took the name Homeromastix (Ὁμηρομάστιξ "Homer whipper"; gen.: Ὁμηρομάστιγος) later in life.

4th-century BC Greek rhetorician and historian

thumb|Relief of a horseman from the so-called "Tomb of Alcetas" in Termessos (modern Turkey) Alcetas (Greek Ἀλκέτας; died 320 BC) was the brother of Perdiccas and the son of Orontes from Orestis. He is first mentioned as one of Alexander the Great's generals in his Indian expedition.

Ruler of Qi between 356 BC and 320 BC