Former Owner
- Lathrop Colgate Harper1
- Lawrence J. Schoenberg1
- Lehn of Denmark1
- Leonardo Lapiccirella2
- Lionardo di Paolo Adimari1
- Lisa Kiser1
- Louis César de La Baume Le Blanc1
- Louis H. Silver1
- Luigi Cora1
- Maggs Bros Ltd1
- Malvezzi de' Medici1
- Marie Thomas1
- Monastery at San Gregorio al Celio1
- Nanna Corbinello1
- Otto Ege2
- Peter Eaton1
- Petrus de Thureyo1
- Piero Ginori Conti3
- Robert Hoe III1
- Royal Library of Belgium1