PAPPUS, an eminent philosopher of Alexandria, said by Suidas to have flourished under the emperor Theodosius the Great, who reigned from A. D. 379 to 395. His writings show him to have been a consummate mathematician: Many of them are lost; the rest continued long in manuscript, detached parts having only been occasionally published in the last century, until Carolus Manolissius published his remains entire at Bologna, in 1660, in folio.