Elegy and Iambus. with an English Translation by. J. M. Edmonds. Cambridge, MA. Harvard University Press. London. William Heinemann Ltd. 1931. 1.
“Agathon: — A writer of tragedy ridiculed for his effeminacy by Aristophanes in the Gerytades; he was a son of Tisamenus the Athenian, and became the bosom-friend of the tragic poet Pausanias, with whom, according to the younger Marsyas, he withdrew to the court of Archelaus. He imitated the elegant style of the orator Gorgias.”
Scholiast on Plato Symposium
“Agathon won at the Lenaean Festival in the archonship of Euphemus （417 B.C.）.”
Athenaeus Doctors at Dinner
“‘I should really be a forgetful man, Agathon,’ said Socrates, ‘if after seeing your courage and self-assurance when you mounted the platform with the actors and faced so large a house, ready to give your declamation, without showing the least sign of nervousness, I should now expect you to be discomposed in the presence of this little company.’”
Plato Symposium
“Agathon: —
Would that Opportunity, which grows best in the soil of discretion, were as clear to view as it is obscure!
Stobaeus Physical Extracts [on the nature of time]