Author
- John of Damascus1
- John of Garland1
- John of Glastonbury1
- John of Saxony1
- John of Seville1
- John of Wales1
- João Freire1
- João Gomes da Silva1
- Juan Gallo1
- Juan Martínez Silíceo1
- Juan de Mena1
- Juan de Torquemada1
- Juana I of Castile1
- Julius III1
- Jörg Muelich1
- Kingdom of Bohemia1
- Kingdom of Naples1
- Kollegium Sankt Nikolaus1
- Laurentius Cynthius1
- Leo I1