- John II, King of Aragon, 1397-14791
- 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
- Judges--Selection and appointment1
- Justa, Saint, -approximately 2871
- Kekchi language1
- Kirchmair, Georg, 1481-15541
- Knights of Malta1
- Labyrinths1
- Ladron de Guevara family1
- Land titles--Registration and transfer1
- Landowners1
- Language and languages1
- Latin language1
- Latin language--Study and teaching1
- Latin poetry1
- Laudatory poetry, Latin1
- Law--Interpretation and construction1
- Learning and scholarship1