- Lello, Tina di1
- Letters, Papal1
- Liber sextus decretalium (Catholic Church)1
- Liebfrauenkirche (Halberstadt, Germany)1
- Literature, Medieval1
- Liturgics--Texts1
- Logic, Medieval1
- Lollards1
- Lord's Supper1
- Louis IX, King of France, 1214-12701
- Louis, Saint, Bishop of Toulouse, 1274-12971
- Ludwig IV, Holy Roman Emperor, 1282?-13471
- Manners and customs1
- Manuscripts, Armenian1
- Manuscripts, Judeo-Arabic1
- Manuscripts, Persian1
- Margaret, of Antioch, Saint1
- Marriage (Canon law)1
- Marriage customs and rites, Medieval1
- Marriage law1