Author
- Petrus de la Cavalleria1
- Philip II of Spain1
- Philip Stos1
- Pierre Bersuire1
- Pius II1
- Pius V1
- Poggio Bracciolini1
- Principio Fabricii1
- Pseudo-Dionysius the Areopagite1
- Qutb al-Din Razi1
- René of Anjou1
- Richard de Fournival1
- Robert Cooke1
- Rupert, Count Palatine of Simmern1
- Rutgerus Hartman1
- Rutilius Taurus Aemilianus Palladius1
- Sancho IV of León and Castile1
- Seneca1
- Shaykh ʻAbd Allāh1
- Sibawayh1