Philips the Fair
Philo
Pico della Mirandola
Plato
Pliny the Younger
Plotinus
Plutarch
Poincare, Henri
Polemo
Polystratus
Pomponazzo
Porphyry
Prodicus
Protagoras
Pyrrho
Pythagoras

R

Reid, Thomas
Renan
Renouvier
Reuchlin
Ribot, Theodule
Richard de Saint-Victor
Roscelin
Rousseau, J. J.
Royer-Collard

S