Author
- Nicolaus von Amsdorf1
- Nikolaus Apel1
- Otto of Passau1
- Panormitanus1
- Paulus Melissus1
- Petrus Alphonsi1
- Petrus Apianus1
- Philip Stos1
- Pius II1
- Pope1
- Priscian1
- Prudentius1
- Pseudo-Aristotle1
- Remigio dei Girolami1
- Remigius of Auxerre1
- Reynoldus Romanus1
- Robert Grosseteste1
- Roman Catholic Archdiocese of Mainz1
- Rupert, Count Palatine of Simmern1
- Rutgerus Hartman1