- Jesus Christ1
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- Jiménez de Cisneros, Francisco, 1436?-15171
- John II, King of Aragon, 1397-14791
- Juana, la Loca, Queen of Castile, 1479-15551
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judaism1
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- Lemos, Pedro Fernández de Castro, conde de, 1576-16221
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