Former Owner
- Oliver R. Barrett1
- Oswald Carl Friedrich von Seilern und Aspang1
- Otto Ege1
- Otto Haas1
- Paul Riant12
- Percy Mordaunt Barnard1
- Peter Ludwig1
- Petrus Hofman Peerlkamp1
- Philadelphia Museum of Art1
- Ramsau Monastery1
- Riddagshausen Abbey1
- Robert Garrett1
- Robert Rossiter Hutton1
- Rosamond B. Loring1
- Rush Hawkins1
- Samuel Addington1
- Samuel Eliot1
- Samuel Matzinger1
- Sant Pere de Rodes1
- Santa María de la Oliva1