- Patrizi, Francesco, 1275-13281
- Patronage, Ecclesiastical1
- Paul, the Hermit, Saint, -approximately 3411
- Peace of Westphalia (1648)1
- Pedro IV, King of Aragon, 1319?-13871
- Penitentials1
- Pentecost1
- Perfection--Religious aspects--Catholic Church1
- Personal correspondence1
- Peru1
- Petrarca, Francesco, 1304-13741
- Pharmacology1
- Philosophers1
- Philosophy and religion1
- Physical appearance of Jesus Christ1
- Pilate, Pontius, active 1st century1
- Pistus, Augustus1
- Plague1
- Planetary theory1
- Platonists1