Author
- Johannes ab Indagine1
- Johannes von Werdea1
- John Cassian1
- John Chrysostom1
- John Cleseby1
- John Davnay1
- John Gage1
- John Gower1
- John Herd1
- John XXII1
- John of Genoa1
- John of Glastonbury1
- John of Howden1
- John of Saxony1
- Juan Gallo1
- Juan Martínez Silíceo1
- Juana I of Castile1
- Juvenal1
- Kingdom of England1
- Konrad III. von Soltau1