- Paul V, Pope, 1552-16211
- Pazzi Conspiracy (1478)1
- Pelagianism1
- Perpetual calendars1
- Persecution1
- Persecution--Early church1
- Persius1
- Personal correspondence1
- Pesciori, Guglielmo1
- Peter Lombard, Bishop of Paris, approximately 1100-11601
- Petrarca, Francesco, 1304-13741
- Pharmacognosy1
- Pharmacology1
- Pharmacy1
- Philip II, King of Macedonia, 382 B.C.-336 B.C.1
- Philip II, King of Spain, 1527-15981
- Philosophy, Medieval, in literature1
- Physical appearance of Jesus Christ1
- Physical sciences1
- Pigments1