Author
- Nicholas III of Constantinople1
- Oglerio di Lucedio1
- Origen1
- Orosius1
- Paschasius Radbertus1
- Peter of Limoges1
- Petrus Riga1
- Philagathus of Cerami1
- Poggio Bracciolini1
- Priscian1
- Proclus1
- Pseudo-Augustine1
- Pseudo-Seneca1
- Publilius Syrus1
- Quodvultdeus1
- Ramon Llull1
- Reynoldus Romanus1
- Robert de Sorbon1
- Stephen Langton1
- Sulpicius Severus1