“Archelaus:— Of Athens or Miletus; his father Apollodorus or, according to some writers, Midon; pupil of Anaxagoras and teacher of Socrates.. He was called the physical philosopher, because with him the study of natural philosophy came to an end, Socrates having introduced that of ethics. It would seem that Archelaus himself studied the new subject, for he has left philosophic treatises on law and goodness and justice. Deriving the subject from him Socrates advanced it so much that he was thought to have invented it. Archelaus maintained that there are two causes of growth or ‘becoming,’ heat and cold, that living things were produced from slime, and that righteousness and its opposite are matters not of nature but of convention.”

Diogenes Laertius Lives of the Philosophers

“Archelaus:—. . He composed a Natural Philosophy . . and there are other works of his.” Suidas Lexicon “And it is clear that he was also deeply attached to his lawful wife, Isodice daughter of Euryptolemus son of Megacles, and took her death very hardly, if we may judge by the elegies written to console him which are thought by the philosopher Panaetius to be the work of the natural philosopher Archelaus —a conjecture which is sound chronologically.”

Plutarch Life of Cimon “The mother of Cimon, etc. （see Melanthius fr. 2）.”