N-R

1. Parmenides (3)
2. Plato (21)
3. Plotinus (8)
4. Proclus Diadochus (5)
5. Pyrrho (4)
6. Pythagoras (7)

Claudius Ptolemy
Claudius Ptolemy was a major astronomer and geographer from the Library at Alexandria.

Panaetius
The philosopher Panaetius is called the founder of Roman stoicism.

Philolaus
When Aristotle described the Pythagoreans, he referred to the writing of the Pythagorean philosopher Philolaus.

Porphyry
Porphyry was a 3rd century A.D. neoplatonist.

Protagoras
Protagoras was the earliest known sophist who taught for pay.