- John II, King of Aragon, 1397-14791
- Juana, la Loca, Queen of Castile, 1479-15551
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism1
- Knowledge, Theory of1
- Landowners1
- Latin language1
- Latin language--Study and teaching1
- Latin poetry1
- Leases1
- Lemos, Pedro Fernández de Castro, conde de, 1576-16221
- Letter of Aristeas1
- León, Luis de, 1527-15911
- Liturgical books1
- Local officials and employees1
- Local officials and employees--Salaries, etc.1
- Logic1
- Lorraine, Nicolas-François, duc de, 1609-16701
- Lucayan Indians1
- Macaronic poetry1