Internet History Sourcebooks Project
Fordham University: Medieval Sourcebook: Lorenzo De Medici: Paternal Advice to a Cardinal
This site from the Medieval Sourcebook includes a letter written by Lorenzo De Medici to his son Giovanni in which he "warns his son to avoid vice and luxury."
Other
One evil.org: 20 Most Evil People of 16th Century: Pope Leo X
This site provides a detailed biography of the infamous Pope Leo X. This man has been accused of making the most damaging statement about Christianity in the history of the Church.
Olga, Helen, Yuri and Sergey Mataev
Olga's Gallery: Raphael
In-depth biography of Raphael from Olga's Gallery including his style and links to his works one being "Portrait of Pope Leo X with Cardinals Giulio de Medici and Luigi de Rossi."