Skeptical School founded by Pyrrho of Elis (about 365-275 BCE). Pyrrho's immediate disciple was Timon.
1.
Ancient Greek Skepticism
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An article on skepticism in Ancient Greece from the Internet Encyclopedia of Philosophy, by Harald Thorsrud of Temple University.
Ancient Skepticism
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From the Stanford Encyclopedia of Philosophy, by Leo Groarke. Article on the two movements in ancient philosophy, Pyrrhonism, and Academic Skepticism.
4.
Aporetic Philosophia
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A discussion of the development of Greek skepticism from Pyrrho to Sextus Empiricus. A reference provided by Aporetic World Music.