- Juan II, King of Castile and Leon, 1405-14541
- Justa, Saint, -approximately 2871
- Justice, Administration of1
- Knights of Malta1
- Ladron de Guevara family1
- Land titles--Registration and transfer1
- Landowners1
- Latin language1
- Latin language--Study and teaching1
- Latin poetry1
- Learning and scholarship1
- Legacies1
- Legaspi, Margarita de1
- Lemos, Pedro Fernández de Castro, conde de, 1576-16221
- Leocadia, Saint, -3031
- Letter of Aristeas1
- León, Luis de, 1527-15911
- Liturgical books1
- Liturgics1
- Local officials and employees--Salaries, etc.1