Author
- Republic of Venice1
- Richard Maidstone1
- Richard Rolle1
- Richard of Middleton1
- Robert Gazeley1
- Robert Holkot1
- Robert Kilwardby1
- Robert de Sorbon1
- Roman Catholic Archdiocese of Siena1
- Sensatus1
- Serapion the Younger1
- Simon de Lenis1
- Stephanus Hugoneti1
- Tengoccio d'Enea de Piccolomini1
- Thomas Brooke1
- Thomas Malyus1
- Thomas of Celano1
- Thomas of Chobham1
- Thomas of Ireland1
- Titus Livius1