- Italy--Rimini1
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- James, the Greater, Saint1
- Jerónima de la Asunción, madre, 1555-16301
- Jewish law1
- Jews--Legal status, laws, etc.1
- Job (Biblical figure)1
- John IV, King of Portugal, 1604-16561
- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- John VIII Palaeologus, Emperor of the East, 1392-14481
- John the Baptist's Day1
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