Former Owner
- Louis-Jean-Nicolas Monmerqué1
- Ludovico Settala1
- Ludwig Rosenthal1
- Luigi Serra di Cassano1
- Malvezzi de' Medici1
- Manuel John Johnson1
- Marcianus F. Rossi1
- Martin Picker1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Matteo Luigi Canonici1
- Maximilian Henry of Bavaria1
- Merlemont family1
- Michael M. Zagayski1
- Michiel family1
- Morris Jastrow, Jr.1
- Mortimer Frank1
- Mr. Hals1
- Museo Cavaleri1
- Nancy McGrath1