Former Owner
- Nicholas B. Scheetz1
- Novalesa Abbey1
- Ohio State University Center for Epigraphical and Palaeographical Studies1
- Oliver R. Barrett1
- Paolo Gallo1
- Paolo Giovio1
- Parroco di Taviano, Luigi Bruno, active 20th century1
- Patrick Brady1
- Paul Gottschalk1
- Paul Sabatier1
- Payne and Foss1
- Peter Christos1
- Peter Ludwig1
- Petrus de Thureyo1
- Pettini Libraria di Antonio Pettini1
- Philip Hofer1
- Pierleone Leoni1
- Piero Ginori Conti1
- Pietro1
- Pietro Antonio Crevenna1