Author
- Petrus Riga1
- Pietro d'Abano1
- Pliny the Elder1
- Pomponius Mela1
- Porphyry1
- Prosper of Aquitaine1
- Pseudo-Bede1
- Pseudo-Eusebius of Cremona1
- Pseudo-Jerome1
- Pseudo-Maximus the Confessor1
- Pseudo-Seneca1
- Ptolemy1
- Publius Papinius Statius1
- Rabanus Maurus1
- Rashi1
- Richard of Middleton1
- Rocca, Antonio1
- Serapion the Younger1
- Sextus Empiricus1
- Sextus the Pythagorean1