- Papal documents1
- Philip III, King of Spain, 1578-16211
- Philip IV, King of Spain, 1605-16651
- Piccolomini, Enea di Bartolomeo de1
- Piccolomini, Maddalena de1
- Pictorial maps1
- Plague1
- Plays1
- Poems1
- Politics and government1
- Prayer books1
- Processionals (Liturgical books)1
- Qazwīnī, ʻAlī ibn ʻUmar, 1203 or 4-1276 or 7. Risālah al-shamsīyah fī al-qawāʻid al-manṭiqīyah1
- Recipes1
- Requesens, Antonio de'1
- Requesens, Berengario de'1
- Requesens, Bernardo de'1
- Requesens, Giuseppe de'1
- Riddles, Persian1
- Rome (Empire)1