Former Owner
- Anthony Askew3
- Arnold Mettler2
- Arthur Annesley, 1st Earl of Anglesey1
- Arthur Brölemann1
- Ashridge Priory4
- Ashton Lever1
- Auburn Theological Seminary1
- Aulne Abbey1
- Aḥmad al-Mudarris1
- Aḥmad ibn Muṣṭafá1
- Baldassarre Boncompagni1
- Bartholus Blancellus1
- Battle Abbey1
- Benjamin Franklin Stevens3
- Benjamin Heywood Bright1
- Bern Dibner1
- Bernard M. Rosenthal1
- Bernard Serrigny1
- Bernardo Bembo1
- Bertram Ashburnham, 4th Earl of Ashburnham5