Former Owner
- Leonardo Bruni1
- Leonhardus Cuntius1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Louis-Jean-Nicolas Monmerqué1
- Ludovico Settala1
- Malvezzi de' Medici1
- Mannucci family1
- Marcianus F. Rossi1
- Mario Maffei1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Matthias Corvinus1
- Merlemont family1
- Michael Wodhull1
- Michel Chasles1
- Michel de Léon1
- Michiel family1
- Murray Anthony Potter1
- Museo Cavaleri1
- Nettie Goldsmith Naumburg1