400s BC births

Parmenion (also Parmenio; ; 400 – 330 BC), son of Philotas, was a Macedonian general in the service of Philip II of Macedon and Alexander the Great. A nobleman, Parmenion rose to become Philip's chief military lieutenant and Alexander's strategos (military general). He was assassinated after his son Philotas was convicted on a charge of treason. His siblings Asander and Agathon would also become prominent members of Alexander's Macedonia.

Speusippus (; ; c. 408 – 339/8 BC) was an ancient Greek philosopher. Speusippus was Plato's nephew by his sister Potone. After Plato's death, c. 348 BC, Speusippus inherited the Academy, near age 60, and remained its head for the next eight years. However, following a stroke, he passed the chair to Xenocrates. Although the successor to Plato in the Academy, Speusippus frequently diverged from Plato's teachings. He rejected Plato's Theory of Forms, and whereas Plato had identified the Good with the ultimate principle, Speusippus maintained that the Good was merely secondary. He also argued that

thumb|Sculpture of Phocion, by François-Nicolas Delaistre, 1824. Phocion (; Phokion; c. 402 – c. 318 BC), nicknamed The Good ( ), was an Athenian statesman and strategos, and the subject of one of Plutarch's Parallel Lives.

4th-century BC Greek poet of Middle Comedy

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.

Hicetas ( or ; c. 400 – c. 335 BC) was a Greek philosopher of the Pythagorean School. He was born in Syracuse, Magna Graecia. Like his fellow Pythagorean Ecphantus and the academic Heraclides Ponticus, he believed that the daily movement of permanent stars was caused by the rotation of the Earth around its axis. When Nicolaus Copernicus referred to Nicetus Syracusanus (Nicetus of Syracuse) in De revolutionibus orbium coelestium (1543) as having been cited by Cicero as an ancient who also argued that the Earth moved, it is believed that he was actually referring to Hicetas. Copernicus, se

Greek ruler of Heraclea (c. 401–353 BC)