Author
- Peter Lombard1
- Peter Paludanus1
- Peter of Poitiers1
- Petrus Bonus1
- Petrus Comestor1
- Petrus Riga1
- Pseudo Bernard of Clairvaux1
- Ptolemy1
- Ranulf Higden1
- Rashid-al-Din Hamadani1
- Raymond of Penyafort1
- Richard Maidstone1
- Robert Gazeley1
- Robert de Sorbon1
- Robert of Gloucester1
- Roman Catholic Archdiocese of Siena1
- Saadia Gaon1
- Salomon ibn Parhon1
- Sarrazius de Bethencourt1
- Saʻīd Najm al-Dīn ʻAjamī1