- Jewish sermons, Hebrew1
- Jiménez de Cisneros, Francisco, 1436?-15171
- John II, King of Aragon, 1397-14791
- John the Baptist's Day1
- Juan II, King of Castile and Leon, 1405-14541
- Juana, of Austria, Princess of Portugal, 1535-15731
- Juana, of Austria, Princess of Portugal, 1535-1573--Correspondence1
- Judaism--Doctrines1
- Judges--Selection and appointment1
- Justa, Saint, -approximately 2871
- Kings and rulers--Genealogy1
- Ladron de Guevara family1
- Land titles--Registration and transfer1
- Latin language1
- Latin language--Study and teaching1
- Latin poetry1
- Law--Interpretation and construction1
- Lawyers1
- Leases1
- Lectionaries1