Author
- Pierre Mathieu1
- Pierre Mésenge1
- Pierre de La Cépède1
- Pseudo-Andronicus of Rhodes1
- Pseudo-Prosper1
- Ptolemy1
- Quintus Aurelius Symmachus1
- Quodvultdeus1
- Rabanus Maurus1
- Ricardus, de Mediavilla, approximately 1249-1308?1
- Richard de Saint-Laurent1
- Robert Grosseteste1
- Robert Holkot1
- Robert Kilwardby1
- Roffredo Epifanio1
- Roman Catholic Archdiocese of Reims1
- Seigneury de Brousses1
- Seneca1
- Sensatus1
- Sidonius Apollinaris1