- James, the Greater, Saint1
- Jerónima de la Asunción, madre, 1555-16301
- John VIII Palaeologus, Emperor of the East, 1392-14481
- John the Baptist's Day1
- Kyriales1
- Latin language--Study and teaching1
- Latin poetry1
- Laudatory poetry1
- Laudatory poetry, Latin1
- Leather bindings1
- Lemos, Pedro Fernández Ruiz de Castro y Osorio, conde de, active 17th century1
- Leo X, Pope, 1475-15211
- Letters patent1
- Liturgical books1
- Liturgies1
- Logic1
- Manuscripts, French1
- Manuscripts, Medieval1
- Manuscripts, Portuguese1
- Marriage (Canon law)1