Author
- Isabella I of Castile1
- Izz al-Din ibn 'Abd al-Salam1
- Jacobo Bellenden1
- Jacobus de Voragine1
- Jami1
- Jewish Community of Amsterdam, Netherlands1
- Jiménez de Enciso, Andrés1
- Joanna I of Naples1
- Joanna of Austria, Princess of Portugal1
- John Frederick II of Saxony1
- John Gage1
- John Skyrrow1
- John de Mowbray, 2nd Baron Mowbray1
- John of Ibelin1
- Joseph Trani1
- Joshua Benzion Segre1
- José Romero de Tejada y Artacho1
- Juan Alvarez1
- Juan Baptista de Gatica1
- Juan Félix de Rújula1