Author
- Johannes Hymmonides1
- Johannes Paulus1
- John Cassian1
- John Chrysostom1
- John Cleseby1
- John Davnay1
- John Lydgate1
- John of Glastonbury1
- John of Saxony1
- John of Wales1
- Juan Gallo1
- Juan Martínez Silíceo1
- Juana I of Castile1
- Kingdom of England1
- Konrad III. von Soltau1
- Lactantius1
- Leo I1
- Leo III1
- Leon Battista Alberti1
- Lope de Espejo1