- John, the Baptist, Saint1
- Judgment Day1
- Kings and rulers--Duties1
- Land tenure1
- Land titles--Registration and transfer1
- Language and languages1
- Latin language, Medieval and modern--Grammar1
- Latin language, Medieval and modern--Study and teaching1
- Latin language--Grammar1
- Latin letters, Medieval and modern1
- Latin poetry1
- Latin poetry, Medieval and modern1
- Laude1
- Law, Medieval1
- Lawyers1
- Learning and scholarship1
- Leather bindings1
- Lenzi family1
- Leo X, Pope, 1475-15211
- Leo XI, Pope, 1535-16051