[Revised entry by Russell Dancy and Giulia De Cesaris on August 29, 2024.
Changes to: Main text, Bibliography, figure1.svg, figure2.svg]
Speusippus of Athens was the son of Plato’s sister Potone; he became head of the Academy on Plato’s death in 348/347 and remained its head for eight years (Diogenes Laertius, Lives IV 1), apparently until his death. His date of birth is harder to get a fix on; it has reasonably been estimated at ca. 410. He apparently wrote a lot: “a great many treatises and many dialogues” (Lives IV 4; Diogenes lists about 30 titles, but his bibliography, by his own admission, is incomplete). We have very…

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