Author
- Muḥammad ibn ʻAbd Allāh Iskāfī1
- Muḥammad ibn ʻAbd al-Ḥamīd Usmandī al-Samarqandī1
- Nasir al-Din al-Tusi1
- Peter of Poitiers1
- Petrus Riga1
- Piccolomini1
- Piccolomo Oltremonti1
- Podestà of Monticchiello (Italy)1
- Ptolemy1
- Qadi Ayyad1
- Roman Catholic Archdiocese of Reims1
- Saadia Gaon1
- Sayf al-Din al-Amidi1
- Sharif Radhi1
- Shihab al-Din al-Qarafi1
- Siena1
- Stephen Langton1
- Tha'ālibī1
- Wace1
- William Rothwell1