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
- Robert de Sorbon1
- Robert of Gloucester1
- Roman Catholic Archdiocese of Siena1
- Sarrazius de Bethencourt1
- Saʻīd Najm al-Dīn ʻAjamī1
- Shams-ud-Din Kermani1
- Sharif Radhi1
- Shāfiʻ ibn ʻaly1
- Taftāzānī, Masʻūd ibn ʻUmar, 1322-1389?1