Author
- Pietro Candido Decembrio1
- Pietro Parenzi1
- Pietro de' Crescenzi1
- Pius II1
- Podestà of Monticchiello (Italy)1
- Porphyry1
- Prosdocimus de Beldemandis1
- Pseudo-Bede1
- Pseudo-Dionysius the Areopagite1
- Pseudo-Joachim of Fiore1
- Pseudo-Phalaris1
- Quintus Curtius Rufus1
- Rabanus Maurus1
- Rafaino Caresini1
- Rashi1
- Remigius of Auxerre1
- René of Anjou1
- Republic of Venice1
- Richard II of England1
- Richard Rolle1