Author
- Peter Paludanus1
- Peter of Limoges1
- Petrus Riga1
- Piccolomini1
- Piccolomo Oltremonti1
- Podestà of Monticchiello (Italy)1
- Pseudo Bernard of Clairvaux1
- Pseudo-Seneca1
- Ptolemy1
- Publilius Syrus1
- Qadi Ayyad1
- Roman Catholic Archdiocese of Reims1
- Saadia Gaon1
- Sayf al-Din al-Amidi1
- Seneca1
- Shams al-Dīn al-Samarqandī1
- Sharif Radhi1
- Shihab al-Din al-Qarafi1
- Siena1
- Stephen Langton1