Former Owner
- Mary Lacaita1
- Matteo Luigi Canonici1
- Matthias Corvinus1
- Merlemont family1
- Michael Kantakouzenos Şeytanoğlu1
- Monasterium sanctorum quadraginta martyrum (Treviso Italy)1
- Morris H. Morgan3
- Morton Davis Mitchell1
- Museo Cavaleri1
- Nettie Goldsmith Naumburg1
- Nicholas Bacon1
- Nicolas Antoine Labbey de Billy1
- Orlandus de Fatiis1
- P. Desq1
- Paul Riant4
- Philip Augustus Hanrott1
- Philip Kerr, 11th Marquess of Lothian1
- Pietro Antonio Crevenna1
- Pontigny Abbey1
- Preston A. Perry1