Author
- Nikolaus von Dinkelsbühl1
- Order of the Argonauts of Saint Nicholas1
- Otto III1
- Paschualis Bernardus1
- Paul of Aegina1
- Peter Lombard1
- Peter Paludanus1
- Petrus de Braco1
- Petrus de Monastero1
- Piccolomini1
- Piccolomo Oltremonti1
- Pierre Bersuire1
- Pietro Parenzi1
- Podestà of Monticchiello (Italy)1
- Priscian1
- Ptolemy1
- Raginaldus Collus Rubeus1
- Raymond of Penyafort1
- Richard II of England1
- Roger Bigod, 2nd Earl of Norfolk1