Saint Augustine by Caravaggio discovered in a private collection

Hidden on a private collection where it was considered as an anonymous this Saint Augustine painted by Caravaggio was discovered on April, 2011:

"A leading scholar, Sebastian Schütze, professor of art history at the University of Vienna and one of the book's co-authors, called the work a significant discovery.

He said: "It has never been published. What looked like an anonymous 17th-century painting revealed its artistic qualities after restoration."

The painting fits in to Caravaggio's oeuvre around 1600, when his style was sculptural and monumental, with powerful movement and emotional expression." (read whole article by The Guardian)"

This is a great discovery and I cannot help thinking about some masterpieces that are in private collections when they should be considered human heritage.