Author
- Peter, Constable of Portugal1
- Petrus Comestor1
- Philip the Bold1
- Pierre Bersuire1
- Pietro Barozzi1
- Pietro Paolo Muscarello1
- Platonic Academy1
- Pliny the Elder1
- Podestà of Monterubbiano (Italy)1
- Porcellio1
- Priscian1
- Pseudo-Cicero1
- Pseudo-Eusebius of Cremona1
- Pseudo-Jerome1
- Qaṣabī, Muḥammad ʻUmar1
- Qutb al-Din Razi1
- Ramon Llull1
- Rapolano Terme1
- Rashid-al-Din Hamadani1
- Regiomontanus1