Former Owner
- Antonio Saverio Gentili1
- Antonio di Matteo di Giovanni Foresi da Bibbiena1
- Antonius Mensing1
- Apostolo Zeno1
- Archibald Cary Coolidge1
- Archibald Primrose, 5th Earl of Rosebery1
- Arenburg2
- Arthur Brölemann2
- Arthur H. Lea4
- Arthur Hood, 1st Baron Hood of Avalon1
- Arthur Lee Loeb1
- Arthur Liddell, 5th Baron Ravensworth1
- Arthur Vershbow2
- Arthur de l'Isle du Dréneuc1
- Asahel Grant1
- Ashton Rollins Sanborn1
- Assemani family1
- Baldassarre Boncompagni1
- Ball Collection2
- Barbarigo family1