Author
- Philippus1
- Pier Francesco Portinari1
- Piero de Ricci1
- Pietro Flores1
- Pietro Lamberti1
- Pius IV1
- Privy Council of the United Kingdom1
- Qasem-e Anvar1
- Qāḍī Zāda al-Rūmī1
- Ranuccio Farnese1
- Regiomontanus1
- Ressani family1
- Richard Ward1
- Roman Catholic Archdiocese of Siena1
- Saadi1
- Safi al-Din al-Urmawi1
- Sangalletti family1
- Sebastian Schindler1
- Simone Gondi1
- Sirāj al-Dīn Abū Ḥafṣ ʻUmar Ibn al-Wardī1