Former Owner
- Mademoiselle de Malberghe1
- Maffeo Pinelli1
- Mannucci family1
- Manoel Pereira da Sylva1
- Marcianus F. Rossi1
- Marco da Bologna1
- Marie-François Duchesne de Beaumanoir2
- Mark Augspürger1
- Marvin-L. Colker1
- Mary Bloch1
- Mary Lacaita2
- Mathias Schurer1
- Matteo Luigi Canonici1
- Matthew Simpson Parkhurst1
- Matthias Corvinus1
- Maurilio Morazio1
- Menaḥem Naḥum, ha-Leṿi, mi-ḳ.ḳ. Dribin1
- Merlemont family1
- Meschatin La Faye family1
- Michael Kantakouzenos Şeytanoğlu1