Pluto with the Cerberus
XVI century. Pencil, Pencil ground, Grey-brown ink on paper.Not on display
An even feebler studio version of the Prado drawing, with the composition cut at the top and sides but otherwise corresponding in all details, is in the Codex Bonola, the Muzeum Narodowe, Warsaw.
Turner, Nicholas, From Michelangelo to Annibale Carracc: a century of Italian drawings from the Prado, Virginia, Art Services International, 2008, p.267