Former Owner
- Novalesa Abbey1
- Oliver Henry Perkins1
- Otto Orren Fisher1
- Parish Church of Waldhausen im Strudengau1
- Pietro Canal1
- Pietro Giometti1
- Pius XI1
- Prince Augustus Frederick, Duke of Sussex1
- R. J. Bunck1
- R. Tolentino1
- Raoul Chandon de Briailles1
- Raul A. Villagran1
- Reginald Cholmondeley1
- Richard Heber1
- Robert Hoe III1
- Robert Williams1
- Royal Library of Belgium1
- Rushton Mather Dorman1
- Saint Michael's Church, Ghent1
- Samuel Dennis1