Which one for the first thinkers to form Free will in antiquity was also well-known for formulation of an atomic theory of the universe?
Democritus Democritus ( ; Greek: Δημόκριτος , "Dēmókritos", meaning "chosen of the people"; c. 460 – c. 370 BC ) was an influential Ancient Greek pre-Socratic philosopher primarily remembered today for his formulation of an atomic theory of the universe.
Diogenes of Apollonia Diogenes of Apollonia ( ; Greek: Διογένης ὁ Ἀπολλωνιάτης ; fl. 5th century BC) was an ancient Greek philosopher, and was a native of the Milesian colony Apollonia in Thrace. He lived for some time in Athens. His doctrines are known chiefly from Diogenes Laërtius and Simplicius. He believed air to be the one source of all being, and, as a primal force, to be intelligent. All other substances are derived from it by condensation and rarefaction. Aristotle has preserved a long passage by Diogenes concerning the organization of the blood vessels.