Author
- Peter of Limoges1
- Philip Sidney1
- Pietro de' Crescenzi1
- Placentinus1
- Polo, Marco, 1254-1323?1
- Pseudo-Augustine1
- Pseudo-Bonaventure1
- Pseudo-Cyprian1
- Pseudo-Llull1
- Pseudo-Seneca1
- Publilius Syrus1
- Raymond of Penyafort1
- Richard Fishacre1
- Richard Treby1
- Richard de Saint-Laurent1
- Robert Beale1
- Robert Grosseteste1
- Robert de Gretham1
- Robert de Sorbon1
- Robert of Gloucester1