Ill go first.
Caravaggio was a master, but one crazy violent mo-fo! I was just watching a documnetary on him, and apparently he used to get in streetfights all the time. He even killed a guy once. Apparently in a duel over some dame, he tried to cut the other guys balls off, but stabbed him in the groin instead and killed him.
Then he was sent to Malta, having it off with a few of the Knights (he was bisexual) The Maltese Knights are said to have killed him in a conspiracy with the pope, because he was bringing art down to a more "earth" level, although they never found his body.