- Jewish law1
- Jews--Legal status, laws, etc.1
- Joachim, Saint1
- Job (Biblical figure)1
- Johannes filius Roberti de Cruce1
- 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
- Jonah (Biblical prophet)1
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism (Christian theology)1
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- Judas Iscariot1
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