- Jaymes, Diego1
- Jews--Persecutions1
- Juan II, King of Castile and Leon, 1405-14541
- Juana, la Loca, Queen of Castile, 1479-15551
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism1
- Justa, Saint, -approximately 2871
- Justice, Administration of1
- Ladron de Guevara family1
- Land titles--Registration and transfer1
- Leases1
- Leather bindings1
- Leocadia, Saint, -3031
- Lepe Carvajal, Alonso de1
- Limp bindings1
- Local officials and employees1
- Magic1
- Manuscripts, European1
- Manuscripts, French1
- Marucelli, Benedetto1