Author
- Richard Treby1
- Richard de Fournival1
- Robine Bordinelle1
- Rocca, Antonio1
- Rodrigo Sánchez de Arévalo1
- Roger Waltham1
- Roman Catholic Archdiocese of Siena1
- Roman Catholic Diocese of Regensburg1
- Rutilius Taurus Aemilianus Palladius1
- Santa Maria in Portico a Fontegiusta1
- Sextus Empiricus1
- Sextus the Pythagorean1
- Siena1
- Sigismund1
- Signoria of Florence1
- Simone di Nicolo Petroni1
- Smoyel1
- Stefano Fieschi1
- Taddea Salamon1
- Thomas de Hibernia1