Former Owner
- Antonio Saverio Gentili1
- Antonius Mensing1
- Apostolo Zeno1
- Arenburg1
- Arthur Brölemann1
- Arthur Hood, 1st Baron Hood of Avalon1
- Arthur Lee Loeb1
- Arthur Liddell, 5th Baron Ravensworth1
- Arthur de l'Isle du Dréneuc1
- Asahel Grant1
- Ashton Rollins Sanborn1
- Assemani family1
- Barbarigo family1
- Barbe de Laon1
- Bartolomeo Amici1
- Bateman family1
- Beatus Rhenanus1
- Benjamin Franklin Stevens1
- Bernard Quaritch1
- Bernardo Bembo1