Former Owner
- Mary Augusta Strachey1
- Mary Schell Collins1
- Matteo Luigi Canonici1
- Maximilian Henry of Bavaria1
- Melk Abbey1
- Michel Chasles1
- Michel de Léon1
- Morris Jastrow, Jr.1
- Mortimer Frank1
- Nicolas Antoine Labbey de Billy1
- Nicolas Fowle1
- Otto Orren Fisher1
- Otto Vollbehr1
- Pangracius Chrewczer1
- Paolo Vimercati Sozzi1
- Petrus Giraud1
- Petrus de Thureyo1
- Philibert-Charles-Marie Varenne de Fenille1
- Philip Kerr, 11th Marquess of Lothian1
- Philip Robinson1