This is a slight variant, trimmed particularly at the top and along the left-hand edge, of the considerably larger drawing in the Roman Album in the British Museum (S. 705; B.M. 1885-3-14-242). Fuseli's source was probably the relief of Mercury weighing the Fates of Hector and Achilles before Jupiter, Juno and Apollo by Vincenzo Pacetti (c. 1746-1820) in the Villa Borghese, Rome, though this was not actually paid for until 1780, two years after Fuseli left Rome for the last time. Another possible source is one of the pseudo-antique reliefs engraved in the Admiranda Bartoli published in Rome in 1690, which also served as a basis for Pacetti's relief. Interestingly, basis of the figure is as much Michelangelo as the Antique. (For the sources of the figure see Schiff, p. 484, no. 705)