Dr Erich Schleier has kindly confirmed the attribution to Turchi, on the basis of a photograph, in a communication dated 16 May 2002. Dr Schleier further notes that the drawing is 'a very beautiful example of his draughtsmanship'.
Although no painted version of this composition survives, two other scenes from the life of Hercules, Hercules and Omphale and The Fury of Hercules, both with strongly articulated central figures and secondary groups receding to the margins as in the present sheet, are in the Alte Pinakothek, Munich, D. Scaglietti Kelescian, Alessandro Turchi, detto l'Orbetto, 1578-1649, exhib. cat., Verona, Museo di Castelvecchio, 1999, figs. 26 and 28. Dr Schleier, in an article which provides the first published assembly of drawings by the artist, notes that both pictures can be dated shortly before 1620 and may be part of a larger series, E. Schleier, 'Drawings by Alessandro Turchi', Master Drawings, IX (1971), p. 143.