320s BC deaths

Perdiccas (, Perdikkas; 355BC – 320BC) was a Macedonian general, successor of Alexander the Great, and the regent of Alexander's empire after his death. When Alexander was dying, he entrusted his signet ring to Perdiccas. Initially the most pre-eminent of the successors, Perdiccas effectively ruled Alexander's increasingly unstable empire from Babylon for three years until his assassination, as the kings he ruled for were incapable.

Callisthenes of Olynthus (/kəˈlɪsθəˌniːz/; Greek: Καλλισθένης; 360 – 327 BCE) was a Greek historian in Macedon with connections to both Aristotle and Alexander the Great. He accompanied Alexander the Great during his Asiatic expedition and served as his historian and publicist. He later opposed Alexander’s adoption of Persian culture and was arrested after being implicated in a plot on the king's life; he died in prison. During his life, he authored several works on Greek history and a biography of Alexander the Great.

4th century BCE Greek politician and orator

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.

Phrataphernes (Median: Fratafarnah, ; lived 4th century BC) was a Persian who held the government of Parthia and Hyrcania, under the king Darius III Codomannus, and joined that monarch with the contingents from the provinces subject to his rule, shortly before the battle of Gaugamela in 331 BC. He afterwards accompanied the king on his flight into Hyrcania.

4th-century BC Macedonian nobleman and soldier