Author
- John de Breton1
- John de Seccheville1
- John of Damascus1
- John of Howden1
- John of Saxony1
- Joseph ben Judah ibn Aknin1
- Judah ben Saul ibn Tibbon1
- Julianus Pomerius1
- Jullien Gervais1
- Kingdom of England1
- Kollegium Sankt Nikolaus1
- Konrad von Brundelsheim1
- Lambert le Bègue1
- Leo III1
- Leo X1
- Leonardo Mainardi1
- Leontios of Neapolis1
- Leopold Camp1
- Lope de Olmedo1
- Lorenzo Belo1