Former Owner
- Eleanor Cross Marquand1
- Eleanor Marquand1
- Gail Fischmann1
- George Spencer, 2nd Earl Spencer1
- Gertrude Lueneburg Carrier1
- Giacomo Soranzo1
- House of Sforza1
- Howel Wills1
- Jacob Riegel1
- John C. Jackson1
- John Morgan1
- Joseph E. Widener1
- Leonello d'Este, Marquis of Ferrara1
- Luigi Cora1
- Luigi Serra di Cassano1
- Maggs Bros Ltd1
- Marchese Porri-Carcani1
- Matteo Luigi Canonici1
- Mercantile Library Company1
- Milton Fischmann1