DEMOCRITUS Democritus (Ancient Greek: Δημόκριτος, Dēmókritos, "judge of the people"; Abdera, c. 460 BC – 370 BC) was an Ancient Greek philosopher. A pupil of Leucippus, he was one of the founders of atomism. It is practically impossible to distinguish the ideas attributable to Democritus from those of his teacher. Democritus was the most prolific writer among the pre-Socratics, considered one of them even though he was actually born after Socrates, to die, perhaps a centenary, during the life of Plato and Aristotle. Among Democritus' pupils was Nausiphanes, master of Epicurus.