Former Owner
- Albert M. Patrick1
- Albert Parker, 3rd Earl of Morley1
- Albert VII of Mansfeld1
- Alexander Hamilton, 10th Duke of Hamilton1
- Alfred Chester Beatty1
- Alfred Morrison1
- Alfred Seymour1
- Alphonse Labitte1
- Andrea Tessier1
- André Le Mercier1
- André Rooryck1
- Antonio Pallavicini Gentili1
- Archibald Cary Coolidge1
- Archibald Primrose, 5th Earl of Rosebery1
- Arenburg1
- Assemani family1
- Athelstan Riley1
- B.S. Cron1
- Benetto Spinelli1
- Biblioteca Trivulziana1