Author
- Joan Martines1
- Johannes Mellarinus1
- Johannes Schöner1
- John Montgomery1
- John de Beauchesne1
- John of Ibelin1
- Joseph Nasi1
- Joseph ben Abraham Gikatilla1
- João Freire1
- João Gomes da Silva1
- Juan Gallo1
- Juan de Zumárraga1
- Juana I of Castile1
- Kamal Khujandi1
- Khwājakīzādah, Muṣṭafá ibn Muḥammad, d. 15901
- Kingdom of England1
- Kollegium Sankt Nikolaus1
- Leo III1
- Leo X1
- Lorenzo Gondi1