Author
- Piccolomo Oltremonti1
- Pietro Flores1
- Pietro Lamberti1
- Pietro Parenzi1
- Pius II1
- Pius IV1
- Podestà of Monticchiello (Italy)1
- Podestà of Perugia1
- Raginaldus Collus Rubeus1
- Rapolano Terme1
- Roger Bigod, 2nd Earl of Norfolk1
- Roman Catholic Archdiocese of Mainz1
- Roman Catholic Diocese of Osma-Soria1
- Roman Catholic Diocese of Zaragoza1
- Roman Curia1
- Sangalletti family1
- Santa Maria in Portico a Fontegiusta1
- Signoria of Florence1
- Simone di Nicolo Petroni1
- Sixtus V1