We are grateful to Dr. Mary Newcome for pointing out that similar subjects were painted by Domenico Piola in 1671 to commemorate the marriage of Giovanni Andrea III Doria Landi to Anna Pamphilj and are now in the Palazzo del Principe Doria at Fassolo, Genoa (exhibited Genoa, Genova nell'Età barocca, 2 May-26 July 1992, pp. 232-3, nos. 131-2, illustrated)