Agathon (Greek: Ἀγάθων) (ca. 448–400 BC) was an Athenian tragic poet an friend of Euripides and Plato. He is best known for being mentioned by Aristophanes in his Thesmophoriazusae and for his appearance in Plato's Symposium, which describes the banquet given to celebrate his obtaining a prize for his first tragedy at the Lenaia in (416). He was the long-term (10-15 years) beloved of Pausanias, who also appears in the Symposium and Protagoras. Together with Pausanias he later moved to the court of Archelaus, king of Macedon, who was recruiting playwrights; it is here that he probably died around 402 BC. He introduced certain innovations into the Greek theater; for example Aristotle (Poetica, 9) tells us that the plot of his Antho was original and not, as was usual at the time, borrowed from mythological subjects.