Author
- Pseudo-Joachim of Fiore1
- Pseudo-Maximus the Confessor1
- Pseudo-Sallust1
- Ptolemy1
- Rabanus Maurus1
- Ramon Llull1
- Rashi1
- Raymond of Penyafort1
- Richard of Middleton1
- Roberto Caracciolo1
- Rutilius Taurus Aemilianus Palladius1
- Sallust1
- Serapion the Younger1
- Sextus Empiricus1
- Sextus the Pythagorean1
- Sicco Polenton1
- Simone Cordo1
- Simone Gondi1
- Stephanus Hugoneti1
- Theophrastus1