- Ordre de Saint-Michel1
- Otto I, Holy Roman Emperor, 912-9731
- Paul III, Pope, 1468-15491
- Personal correspondence1
- Phanariots1
- Philip III, King of Spain, 1578-16211
- Philipp I, Landgraf von Hessen, 1504-15671
- Political science1
- Popes--Temporal power1
- Prayer--Islam1
- Qurʼan1
- Recitations1
- Requesens, Antonio de'1
- Requesens, Berengario de'1
- Requesens, Bernardo de'1
- Requesens, Giuseppe de'1
- Romania1
- Rosselmini, Giovanni1
- Rosselmini, Gregorio Tommaso1
- Salt industry and trade--Law and legislation1