Author
- Nassābah, ḥasan ibn Muḥammad, d. 14071
- Nicholas of Salerno1
- Nur al-Din al-Sabuni1
- Oglerio di Lucedio1
- Order of the Argonauts of Saint Nicholas1
- Pedro de Serra1
- Pepo d'Antonio di Lando Degli Albizzi1
- Peter Pascual1
- Petrus de Monastero1
- Porphyry1
- Pseudo Bernard of Clairvaux1
- Ptolemy1
- Rafaino Caresini1
- Ralph of Longchamp1
- Ranulf Higden1
- Rashid-al-Din Hamadani1
- Republic of Venice1
- Richard Rolle1
- Robert de Sorbon1
- Robert of Gloucester1