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Speusippus (408 - 339/8 BC) was an ancient Greek philosopher. After Plato's death, he inherited the Academy and remained its head for the next eight years, but suffered a stroke, and passed the chair to Xenocrates. Although the successor to Plato in the Academy, he frequently diverged from Plato's teachings. He rejected Plato's Theory of Forms, and whereas Plato had identified the Good with the ultimate principle, Speusippus maintained that the Good was merely secondary. He also argued that it is impossible to have satisfactory knowledge of any thing without knowing all the differences by which it is separated from everything else. Engraving from "The History of Philosophy" by Thomas Stanley published in three successive volumes between 1655 and 1661.
