Author
- Pseudo-Eusebius of Cremona1
- Pseudo-Jerome1
- Ptolemy1
- Rapolano Terme1
- Remigio dei Girolami1
- Reynoldus Romanus1
- Richard Burdet1
- Richard Nykke1
- Richard Treby1
- Richard of Saint Victor1
- Roman Catholic Archdiocese of Siena1
- Roman Catholic Diocese of Zaragoza1
- Roman Curia1
- Rutilius Taurus Aemilianus Palladius1
- Sacro Regio Consiglio1
- Sallust1
- Santa Maria in Portico a Fontegiusta1
- Siena1
- Signoria of Florence1
- Simone di Nicolo Petroni1