Gorgias

Ancient Greek sophist and rhetorician from Leontini, Sicily — who argued that nothing exists, that even if it did it could not be known, and that even if it could be known it could not be communicated — and who developed rhetoric as the supreme art of persuasion.

Creates the nihilistic argument and the science of rhetoric — Gorgias's On Nature or the Non-Existent is the most radical skeptical argument in ancient philosophy; his development of rhetoric as a teachable art with specific techniques established the study of persuasion as a distinct discipline.