Author
- Pietro de' Crescenzi1
- Pius II1
- Procopius1
- Prosdocimus de Beldemandis1
- Pseudo-Dionysius the Areopagite1
- Ptolemy1
- Quintus Curtius Rufus1
- Rabanus Maurus1
- Remigius of Auxerre1
- René of Anjou1
- Richard Carmarden1
- Richard Rolle1
- Richard de Fournival1
- Rudulphus Bollartus1
- Rui de Pina1
- Rutilius Taurus Aemilianus Palladius1
- Sancho IV of León and Castile1
- Scipione Bargagli1
- Syriac Orthodox Church1
- Theodore of Mopsuestia1