Philosophical skepticism is a family of philosophical views that question the possibility of knowledge. It differs from other forms of skepticism in that it even rejects very plausible knowledge claim
Pyrrho
…Pyrrho of Elis (; Ancient Greek: Πύρρων ὁ Ἠλεῖος; c. 360 – c. 270 BC) was a Greek philosopher of Classical antiquity, credited as being the first Greek skeptic philosopher and founder of Pyrrhonism. Pyrrho of Elis is estimated to have lived from around 365/360 until 275/270 BCE. Pyrrho was from Elis, on the Ionian Sea…
Skeptics in Raphael's School of Athens painting. 1. Pythodorus 2. Arcesilaus of Pitane 3. Carneades of Cyrene 4. Pyrrho of Elis 5. Timon of Phlius 6. Theodorus the Atheist of Cyrene