390s BC births

Xenocrates (; ; c. 396/5314/3 BC) of Chalcedon was a Greek philosopher, mathematician, and leader (scholarch) of the Platonic Academy from 339/8 to 314/3 BC. His teachings followed those of Plato, which he attempted to define more closely, often with mathematical elements. He distinguished three forms of being: the sensible, the intelligible, and a third compounded of the two, to which correspond respectively, sense, intellect and opinion. He considered unity and duality to be gods which rule the universe, and the soul a self-moving number. God pervades all things, and there are daemonical pow

Qin State statesman, chancellor and reformer (c. 390–338 BC)

Greek philosopher and astronomer (c.390–c.310 BC)

4th century BCE Greek politician and orator

thumb|Roman copy of an anonymous Greek portrait type of the late 4th or early 3rd century BCE, often identified as Hypereides (Ny Carlsberg Glyptotek) Hypereides or Hyperides (, Hypereidēs; c. 390 – 322 BC; English pronunciation with the stress variably on the penultimate or antepenultimate syllable) was an Athenian logographer (speech writer). He was one of the ten Attic orators included in the "Alexandrian canon" compiled by Aristophanes of Byzantium and Aristarchus of Samothrace in the third century BC.

Sicilian tyrant

Ancient Macedonian courtier and general

Kalanos, also spelled Calanus () ( – 323 BCE), was an ancient Indian gymnosophist, a Brahmin sage , and philosopher from Taxila who accompanied Alexander the Great and was his teacher. He accompanied Alexander the Great to Persis and, after falling ill, immolated himself by entering a pyre in front of Alexander's army. Diodorus Siculus called him Caranus ().

Dinostratus (; c. 390 – c. 320 BCE) was a Greek mathematician and geometer, and the brother of Menaechmus. He is known for using the quadratrix to solve the problem of squaring the circle.

4th-century BC ruler of Bithynia