Date: circa 1618. Dimensions: sheet: 27.3 x 19.2 cm (10 3/4 x 7 9/16 in.); ; mount: 39.5 x 30.9 cm (15 9/16 x 12 3/16 in.). Medium: pen and brown ink with brown wash. Collection: National Gallery of Art. Giovanni Francesco Barbieri, called Guercino, Hercules Slaying the Hydra, c. 1618, NGA 138337
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