- Jews--Persecutions1
- Jiménez de Cisneros, Francisco, 1436?-15171
- Jiménez de Enciso family1
- Jiménez de Enciso, Andrés1
- Jiménez de Enciso, Diego1
- Jiménez de Enciso, Pedro1
- John II, King of Aragon, 1397-14791
- Juana, la Loca, Queen of Castile, 1479-15551
- Justa, Saint, -approximately 2871
- Justice, Administration of1
- Kirchmair, Georg, 1481-15541
- Knights of Malta1
- Land grants1
- Land titles--Registration and transfer1
- Learning and scholarship1
- Leather bindings1
- Legacies1
- Legaspi, Margarita de1
- Leocadia, Saint, -3031
- Lepe Carvajal, Alonso de1