Former Owner
- Arnold Jansen op de Haar1
- Artemesia Piccolomini1
- Arthur Annesley, 1st Earl of Anglesey1
- Arthur Brölemann1
- Arthur Hood, 1st Baron Hood of Avalon1
- Arthur Kay1
- Arthur M. Ellis1
- Ashton Lever1
- Audry Wilkens1
- Austin, Jehan1
- Baldasarre Boncompagni1
- Baptist Union Theological Seminary1
- Barbarigo family1
- Barbe de Laon1
- Baron Llangattock1
- Bartolomeo Amici1
- Bateman family1
- Battle Abbey1
- Beatrice de Fouar1
- Beatus Rhenanus1