Author
- John Eyr1
- John Frederick II of Saxony1
- John Gage1
- John Herd1
- John of Ibelin1
- John Dokeianos1
- João Gomes da Silva1
- Juan Baptista de Gatica1
- Juan Perez Barahona1
- Juan Pérez de Cabrera1
- Juan de Foxá1
- Juan de Garnica1
- Juan de Zumárraga1
- Judah Halevi1
- Khalīl ibn Shāhīn1
- Kingdom of France1
- Leo X1
- Leonardo Bruni1
- Leonhard Freisleben1
- Lescut1