Former Owner
- Martin Schøyen1
- Mary Stanley, Countess of Derby1
- Mary, Queen of Scots1
- Matthew Bloxam1
- Maurice Johnson1
- Miguel de Mayora1
- Milt Freudenheim1
- Monastery at San Gregorio al Celio1
- Muḥammad Ṣadr al-Dīn1
- Nathaniel Sherman Bouton1
- Nonnberg Abbey1
- Octave Chavaillor1
- Oliver R. Barrett1
- Paolino Gianfilippi1
- Pauline Fore Moffitt1
- Peter Ludwig1
- Philip Carteret Webb1
- Philip III the Good1
- Philippe de Béthune1
- Phoebe Hearst1