Diagoras the Atheist of Melos was a Greekpoet and sophist. He became an atheist after an incident that happened against him went unpunished by the gods.
Diagoras has been called a student of Democritus, although some sources claim that he was bought from slavery by Democritus in 411 BC, when Melos was captured by Alcibiades, and then became his student.
Diagoras was condemned to death at Athens and a price was put on his head.