Martyrdom of St. Erasmus
As http://www.mcah.columbia.edu/monographs/poussin/html/poussin_erasmus.html says, a smaller modello is at the National Gallery of Canada (https://www.gallery.ca/en/see/collections/artwork.php?mkey=9004), and a preparatory pen and ink drawing at the Uffizi in Florence, Italy.
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