Author
- Omar Khayyám1
- Onasander1
- Orosius1
- Otto of Passau1
- Palazzo degli Anziani1
- Panormitanus1
- Patrick Graham, 1st Lord Graham1
- Paul of Pergula1
- Paul of Venice1
- Perets ben Yitsḥak Ghirondi1
- Peter Paludanus1
- Peter Pascual1
- Peter Schmieher1
- Peter of Poitiers1
- Peter, Constable of Portugal1
- Petrus Comestor1
- Philagathus of Cerami1
- Pietro Barozzi1
- Pietro Paolo Muscarello1
- Platonic Academy1