- Piccolomini, Antonio Maria d'Enea1
- Piccolomini, Giacomo di Piero1
- Piccolomini, Giovanni d'Andrea di Nanni Todeschini, 1475-15371
- Pictorial works1
- Pigments1
- Pius V, Pope, 1504-15721
- Poetics (Aristotle)1
- Political science1
- Pythagoras and Pythagorean school1
- Recipes1
- Regula (Benedict, Saint, Abbot of Monte Cassino)1
- Requesens family1
- Requesens, Berengario de'1
- Requesens, Eleonora de'1
- Requesens, Francesco Benedetto de'1
- Requesens, Francesco de'1
- Requesens, Galcerando de'1
- Requesens, Giuseppe de'1
- Requesens, Ludovico de'1
- Requesens, Luigi de'1