Author
- Nicholas of Lyra1
- Nicholas of Salerno1
- Nicoluccio di Ascoli1
- Oglerio di Lucedio1
- Pedro de Serra1
- Peter Damian1
- Peter Lombard1
- Peter Olivi1
- Peter of Poitiers1
- Petrus de Monastero1
- Pierre de Maucreux1
- Pietro de' Crescenzi1
- Placentinus1
- Porphyry1
- Pseudo Bernard of Clairvaux1
- Pseudo-Andronicus of Rhodes1
- Pseudo-Cicero1
- Pseudo-Jerome1
- Ralph of Longchamp1
- Ramon Llull1