Author
- John of Garland1
- John of Glastonbury1
- John of Howden1
- John of Saxony1
- John of Seville ?1
- João Freire1
- João Gomes da Silva1
- Juan Gallo1
- Juan Luis Vives1
- Juan Martínez Silíceo1
- Juan Valenzuela Velázquez1
- Juan de Mena1
- Juan de Torquemada1
- Juana I of Castile1
- Julius III1
- Jörg Muelich1
- Kingdom of Bohemia1
- Kingdom of Naples1
- Kollegium Sankt Nikolaus1
- Lambert le Bègue1