Former Owner
- Melk Abbey1
- Miguel de Mayora1
- Milt Freudenheim1
- Moissac Abbey1
- Monasterio de El Paular1
- Monastery at San Gregorio al Celio1
- Nathaniel Sherman Bouton1
- Novalesa Abbey1
- Oliver Henry Perkins1
- Otto Ege1
- Otto Orren Fisher1
- Otto Schäfer1
- P. Desq1
- Paolino Gianfilippi1
- Paul de Berthou1
- Peterborough Central Library1
- Philip III the Good1
- Piero Ginori Conti1
- Pietro Antonio Crevenna1
- Pietro Antonio Maffei1