Author
- Raginaldus Collus Rubeus1
- Ralph of Longchamp1
- Ramon Llull1
- Ranulf Higden1
- Remigius of Auxerre1
- Republic of Venice1
- Richard II of England1
- Richard Rolle1
- Richard de Fournival1
- Richard de Geveldale1
- Roberto Caracciolo1
- Roger Bigod, 2nd Earl of Norfolk1
- Roman Catholic Archdiocese of Siena1
- Rutilius Taurus Aemilianus Palladius1
- Sebastian Schindler1
- Serapion the Younger1
- Sextus the Pythagorean1
- Siena1
- Simon Bredon1
- Sixtus IV1