- Pedro IV, King of Aragon, 1319?-13871
- Pego, Jacobus de1
- Penmanship manuals1
- Perfection--Religious aspects--Catholic Church1
- Perpetual calendars1
- Persecution1
- Persecution--Early church1
- Personal correspondence1
- Peru1
- Petrus, de Herenthals, 1322-1390 or 13911
- Pharmacognosy1
- Pharmacy1
- Pharsalia (Lucan)1
- Philip II, King of Spain, 1527-15981
- Philip III, King of Spain, 1578-16211
- Philip IV, King of Spain, 1605-16651
- Philosophers1
- Philosophy, Ancient--Study and teaching1
- Philosophy--Study and teaching1
- Physical appearance of Jesus Christ1