Author
- Oglerio di Lucedio1
- Order of the Argonauts of Saint Nicholas1
- Pedro de Serra1
- Peter Lombard1
- Peter Olivi1
- Peter of Poitiers1
- Pietro de' Crescenzi1
- Placentinus1
- Porphyry1
- Priscian1
- Pseudo Bernard of Clairvaux1
- Pseudo-Andronicus of Rhodes1
- Pseudo-Cicero1
- Rafaino Caresini1
- Ranulf Higden1
- Rashi1
- Republic of Venice1
- Richard Maidstone1
- Richard Rolle1
- Richard of Middleton1