https://en.wikipedia.org/wiki/Isabella_Stewart_Gardner_Museu...
There is also a Netflix documentary on the theft called "This is a Robbery"
https://web.archive.org/web/20221209104039/https://www.lapha...
https://en.wikipedia.org/wiki/Bernard_Berenson
There's also a nice article about Berenson (sadly paywalled) here:
https://newcriterion.com/issues/2013/12/bernard-berenson-rev...
It starts with one of my favorite Berenson anecdotes:
An amusing story used to circulate in Florence in the late summer of 1944, a few months before the Allied armies of General Clark pushed the Germans northwards to ultimate defeat. Bernard Berenson, who had been in hiding for over a year, was finally able to walk again along the picturesque country lanes of Settignano that he knew and loved so well. On the first day out, a United States Army vehicle stopped alongside the diminutive, bearded, and impeccably attired gentleman. A G.I. leaned out and, in dreadful pidgin Italian, asked for directions. Mr. Berenson obliged, but naturally in the subtly nuanced and inflected phrases for which his English was famous. Stunned, the G.I. asked: “Hey, buddy, are you American?” When Berenson politely confirmed that he was, the soldier could hardly believe it — “Then what’ you doin’ in a dump like this?”