His circular Medusa can be found in the Ufizzi as can his Bacchus.  
John Ruskin denounced him for "feeding upon horror and ugliness and filthiness of sin."  His circular Medusa can be found in the Ufizzi as can his Bacchus.  Neither was as controversial as the bare feet of Mary shown in his Death of the Virgin.  These were all painted before he fled to Naples after stabbing a man in the groin over a tennis match.  Sadly, he had finished all his great paintings, like Judith Beheading Holofernes and Supper at Emmaus, by then.  FTP, name this master of tenebrism, who painted The Conversion of St. Paul and The Calling of St. Matthew and was born Michelangelo da Merisi.
John Ruskin denounced him for "feeding upon horror and ugliness and filthiness of sin."  
Caravaggio (accept Michelangelo da Merisi before it is mentioned)