- Pedro IV, King of Aragon, 1319?-13871
- Pelagianism1
- Perez Barahona, Juan, active 1560-15621
- Peru1
- Peru (Viceroyalty). Real Caja de Cuzco1
- Peru--Cuzco1
- Philip II, King of Spain, 1527-15981
- Philip III, King of Spain, 1578-16211
- Philip IV, King of Spain, 1605-16651
- Pictorial works1
- Poetry1
- Political science--Politics and government1
- Politics and government1
- Portraits1
- Real property1
- Rendón y Sarmiento family1
- Requesens, Antonio de'1
- Requesens, Berengario de'1
- Requesens, Bernardo de'1
- Requesens, Giuseppe de'1