Cristoforo Roncalli art links 

Art Institute of Chicago   NEW!

J. Paul Getty Museum, Los Angeles
Angel Holding a Book, 1583

Louvre Museum Graphic Art Database, Paris (in French)   NEW!  

Courtauld Institute of Art, London, UK
3 works by or related to the artist

Harvard University Art Museums, Massachusetts

Palais Fesch Musée des Beaux-Arts, Ajaccio, France (in French)  

State Museums of Florence Digital Archive, Italy

The Albertina Graphic Art Databank, Vienna (in German)   NEW!  

 

Cristoforo Roncalli in the Art Renewal Center

Cristoforo Roncalli in the Web Gallery of Art  

Bildindex der Kunst und Architektur (in German)  
(a welcome screen is displayed for a couple of seconds before the search results appear)

 

Grove Dictionary of Art Online (excerpt)  

Union List of Artist Names (Getty Museum)  
Reference sheet with basic information about the artist and pointers to other references.

Oxford Dictionary of Art (eNotes)   NEW!