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.
Hermippus of Smyrna Hermippus of Smyrna (Greek: Ἕρμιππος ὁ Σμυρναίος ), a Peripatetic philosopher, surnamed by the ancient writers the "Callimachian" (Greek: ό Καλλιμάχειος ), from which it may be inferred that he was a disciple of Callimachus about the middle of the 3rd century BC, while the fact of his having written the life of Chrysippus proves that he lived to about the end of the century. His writings seem to have been of very great importance and value. They are repeatedly referred to by the ancient writers, under many titles, of which, however, most, if not all, seem to have been chapters of his great biographical work, which is often quoted under the title of "Lives" ("Bioi"). The work contained the biographies of a great many ancient figures, including orators, poets, historians, and philosophers. It contained the earliest known biography of Aristotle, as well as philosophers such as Pythagoras, Empedocles, Heraclitus, Democritus, Zeno, Socrates, Plato, Antisthenes, Diogenes, Stilpo, Epicurus, Theophrastus, Heraclides, Demetrius Phalereus, and Chrysippus. The work has been lost, but many later "Lives" extensively quote it.