Author
- Peter Schmieher1
- Pietro Paolo Muscarello1
- Pius II1
- Platonic Academy1
- Podestà of Monterubbiano (Italy)1
- Porcellio1
- Qadi Ayyad1
- Rapolano Terme1
- Richard Burdet1
- Robert de Saint-Martin1
- Roman Catholic Archdiocese of Siena1
- Roman Catholic Diocese of Zaragoza1
- Roman Curia1
- Sacro Regio Consiglio1
- Safi al-Din al-Urmawi1
- Sallust1
- Santa Maria in Portico a Fontegiusta1
- Sextus Empiricus1
- Siena1
- Signoria of Florence1