Former Owner
- Philip Robinson1
- Phillip J. Pirages Fine Books & Manuscripts1
- Pierre Fraenkel1
- Pietro Antonio Maffei1
- Pietro Canal1
- Pietro Giometti1
- Pietro Giuseppe Ignati Mattei Cattochii1
- Pietro Millini1
- Pietro Odescalchi1
- Poblet Monastery1
- Prediger (Schwäbisch Gmünd)1
- Prince Augustus Frederick, Duke of Sussex1
- Prospero Caffarelli1
- R. H. Fenn1
- R. J. Bunck1
- Rafael Gomes1
- Ramsau Monastery1
- Ramón de Mesonero Romanos1
- Raphael Nathan Nata Rabinowitz1
- Reginald Cholmondeley1