Former Owner
- Arthur Thomas Bannister1
- Arthur de l'Isle du Dréneuc1
- Ashton Lever1
- Ashton Rollins Sanborn1
- Assemani family1
- Athelstan Riley1
- Audry Wilkens1
- Austin, Jehan1
- Avraham Yedidiah Levi1
- B.C. Barker-Benfield1
- B.L. Riese1
- Baldasarre Boncompagni1
- Baptist Union Theological Seminary1
- Barbara Hackenmayrin1
- Barbarigo family1
- Barbe de Laon1
- Baron Llangattock1
- Bartholdus and Johann Flachmann1
- Bartholus Blancellus1
- Bartolomeo Amici1