Author
- Jean Dupin1
- Jean Germain1
- Jean de Wavrin1
- Jean-François Roussin1
- Joan Martines1
- John Burgh1
- John Capgrave1
- John Gower1
- John Tiptoft, 1st Earl of Worcester1
- John of Ibelin1
- Joseph Haslewood1
- João Freire1
- Juan Páez de Castro1
- Julianus Pomerius1
- Juvenal1
- Kingdom of England1
- Kingdom of Naples1
- Lactantius1
- Leo X1
- Leon Battista Alberti1