- Isabella I, Queen of Spain, 1451-15041
- Islam1
- Italy--Bergamo1
- Italy--Naples1
- Jesuit drama, Spanish1
- John I, King of Portugal, 1357-14331
- Juana, of Austria, Princess of Portugal, 1535-15731
- Latin language--Study and teaching1
- Latin poetry1
- Laudatory poetry, Latin1
- Lemos, Pedro Fernández Ruiz de Castro y Osorio, conde de, active 17th century1
- Lemos, Pedro Fernández de Castro, conde de, 1576-16221
- Liturgical books1
- Magic1
- Manuscripts, Arabic1
- Manuscripts, English1
- Manuscripts, Galician1
- Manuscripts, German1
- Manuscripts, Portuguese1
- Maps1