Author
- Raymond of Sabunde1
- Regiomontanus1
- Richard Bolter1
- Richard Burdet1
- Richard II of England1
- Robert de Saint-Martin1
- Roman Catholic Archdiocese of Mainz1
- Roman Catholic Archdiocese of Siena1
- Roman Catholic Diocese of Osma-Soria1
- Roman Catholic Diocese of Regensburg1
- Roman Catholic Diocese of Zaragoza1
- Roman Curia1
- Sacro Regio Consiglio1
- Safi al-Din al-Urmawi1
- Santa Maria in Portico a Fontegiusta1
- Seifrit1
- Seneca1
- Sextus Empiricus1
- Sidrac1
- Siena1