Author
- John of Lancaster, 1st Duke of Bedford1
- John Dokeianos1
- John, Duke of Berry1
- Joseph ben Moses Sarfati1
- Josephus1
- Juan Martínez Silíceo1
- Juan de Mena1
- Juan de Torquemada1
- Juana I of Castile1
- Julius III1
- Jullien Gervais1
- Justin1
- Kingdom of Bohemia1
- Kingdom of England1
- Kingdom of France1
- Kollegium Sankt Nikolaus1
- Konrad III. von Soltau1
- Lactantius1
- Laurentius Cynthius1
- Leo I1