Former Owner
- John B. Stetson Jr.1
- John Boyd Thacher I1
- John Caryll1
- John Frederick Lewis8
- John Ruskin1
- Joseph Barrois2
- Juana I of Castile1
- Justin MacCarthy Reagh1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Kloster Kuringen1
- Louis César de La Baume Le Blanc2
- Louis XII of France1
- Louis de Gruuthuse2
- Mademoiselle de Malberghe1
- Maggs Bros Ltd2
- Margaret of Croy1
- Mary W. T. Dickinson1
- Mary, Queen of Scots1
- Merlemont family1
- Milton Fischmann1