We are grateful to Professor Marina Magrini for confirming the attribution from a transparency; she dates the present picture before 1750 and points out that the composition is loosely related to Giambattista Tiepolo's painting of the same subject in the John G. Johnson Collection at the Philadelphia Museum of Art (A. Morassi, A Complete Catalogue of the Paintings of G. B. Tiepolo, London, 1962, p.44 and fig.245)