Sextus Empiricus (c. 160–c. 210 AD)

Greek physician and philosopher. He was an exponent of scepticism of an agnostic, not a dogmatic, kind – that is, he rejected the view that knowledge was demonstrably impossible, and he insisted on keeping an open mind on this as on other questions. His most important work is the Outlines of Pyrrhonism – a summary of the scepticism of Greek philosopher Pyrrho and his successors.

His other surviving works are Against the Learned and Against the Dogmatists. Sextus' work is a valuable source for the history of philosophy, because of his impartiality in presenting the arguments of his opponents. Little is known of his life.