Callias, d. c.370 B.C., Athenian leader, one of the generals of the Peloponnesian War. In his old age Callias was one of the ambassadors sent to Sparta with Callistratus to negotiate a peace treaty in 371 B.C. The treaty was ineffective, and friction between Epaminondas of Thebes and Agesilaus II of Sparta became acute. Callias was a rich man and his wealth was ridiculed by his contemporaries, including Aristophanes. His house is the scene of Xenophon's Symposium and Plato's Protagoras.
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