Author
- Jean de Meun1
- Joanna I of Naples1
- Johannes von Freiburg1
- John Gower1
- John Halgren of Abbeville1
- John Larry England1
- John Wycliffe1
- John de Mowbray, 2nd Baron Mowbray1
- John of Saxony1
- John of Wales1
- Joseph ben Abraham Gikatilla1
- Joseph ben Judah ibn Aknin1
- Kalāʼī, Muḥammad ibn Sharaf, d. 13751
- Kamāl al-Dīn Turkumānī1
- Kingdom of France1
- Konrad III. von Soltau1
- Lodovico della Torre1
- Luke the Evangelist1
- Malik ibn Anas1
- Marceiu Vinnen1