The Ancient Greek philosophers Plato, Cratylus and Pyrrho as well as Roman philosopher Sextus Empiricus are among those who expounded theories of radical skepticism.
Sextus Empiricus | Sextus Pompey | Sextus Roscius | Sextus Pompeius Festus | Sextus Aelius Paetus Catus |
For example, what is thought to be the introductory section of Parmenides' poem on the Ways of Truth and Opinion was quoted by Sextus Empiricus and Simplicius; in Diels-Kranz this is labeled as fragment 28B1 — i.e., chapter 28, section B, fragment 1.
None of Philo's works are extant; our knowledge of his views is derived from Numenius, Sextus Empiricus and Cicero.
Subsequently, in Hamburg, he assisted the major bibliographer Johann Albert Fabricius in the production of his Bibliotheca Graeca and his edition of Sextus Empiricus.