- Philip III, King of Spain, 1578-16212
- Philip IV, King of Spain, 1605-16652
- Pigments2
- Pius IV, Pope, 1499-15652
- Pius V, Pope, 1504-15722
- Planets2
- Popes2
- Portugal2
- Prices (Provenance)2
- Privileges and immunities2
- Providence and government of God--Christianity2
- Pythagoras and Pythagorean school2
- Recipes2
- Reformation2
- Regula (Benedict, Saint, Abbot of Monte Cassino)2
- Rhetoric, Ancient2
- Romances2
- Romances, Latin (Medieval and modern)2
- Romania--Transylvania2
- Salt industry and trade--Law and legislation2