Author
- Panormitanus2
- Paschasius Radbertus2
- Paul of Pergula2
- Petrus Aureolus2
- Piccolomini2
- Pierre Danes2
- Pietro Candido Decembrio2
- Pliny the Elder2
- Prosper of Aquitaine2
- Pseudo-Jerome2
- Pseudo-Joachim of Fiore2
- Regiomontanus2
- Remigius of Auxerre2
- Richard of Middleton2
- Robert Holkot2
- Rodrigo Sánchez de Arévalo2
- Roger Alban2
- Rutilius Taurus Aemilianus Palladius2
- Sicco Polenton2
- Sixtus V2