- Isidore, of Seville, Saint, -6361
- Islam1
- Islamic law1
- Italy1
- Jerónima de la Asunción, madre, 1555-16301
- Jesuit drama, Spanish1
- Jews1
- Jiménez de Cisneros, Francisco, 1436?-15171
- John II, King of Aragon, 1397-14791
- John the Baptist's Day1
- Juana, of Austria, Princess of Portugal, 1535-15731
- Justa, Saint, -approximately 2871
- Knights of Malta1
- Landowners1
- Latin language--Study and teaching1
- Latin poetry1
- Legal documents1
- Lemos, Pedro Fernández de Castro, conde de, 1576-16221
- Leocadia, Saint, -3031
- Letter of Aristeas1