- Iḥyāʼ ʻulūm al-dīn (Ghazzālī)2
- Jerome, Saint, -419 or 4202
- Jesuits2
- Jewish interpretations of Jesus Christ2
- Jewish merchants2
- Jews--Charities2
- Jews--Dietary laws2
- Jews--Legal status, laws, etc.2
- Jews--Social life and customs2
- John I, King of Portugal, 1357-14332
- Judaism--Customs and practices2
- Judeo-Arabic language2
- Julius III, Pope, 1487-15552
- Justice, Administration of2
- Kings and rulers--Genealogy2
- Land titles2
- Latin literature, Medieval and modern2
- Latin poetry, Medieval and modern2
- Legal petitions2
- Legends2