of Plato. Aristotle (c. 384 - 322 BCE). A polymath whose works ranged across all philosophical fields. Pyrrho of Elis (c. 360 - 270 BCE). Skeptic . Strato of Lampsacus (c. 340 BCE-c. 268 BCE). Atheist , Materialist . Euclid (c. 325 - 265 BCE). Founder of Euclidean geometry. [ edit