- Jewish interpretations of Jesus Christ1
- Jewish law1
- Jews--Persecutions1
- Jiménez de Enciso family1
- Jiménez de Enciso, Andrés1
- Jiménez de Enciso, Diego1
- Jiménez de Enciso, Pedro1
- 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
- Justa, Saint, -approximately 2871
- Justice, Administration of1
- Kirchmair, Georg, 1481-15541
- Knights of Malta1
- Ladron de Guevara family1
- Land titles--Registration and transfer1
- Laudatory poetry, Latin1
- Learning and scholarship1
- Leases1
- Legacies1