Author
- Nilus of Constantinople1
- Normandy1
- Oglerio di Lucedio1
- Perrin Remiet1
- Peter Damian1
- Peter Lombard1
- Peter Olivi1
- Peter Pascual1
- Peter of Poitiers1
- Pierre de Maucreux1
- Pietro de' Crescenzi1
- Placentinus1
- Porphyry1
- Priscian1
- Pseudo Bernard of Clairvaux1
- Pseudo-Andronicus of Rhodes1
- Pseudo-Cicero1
- Pseudo-Jerome1
- Qutb al-Din Razi1
- Rafaino Caresini1