Another Rubens portrait, of another Genoese lady, from the same year as the one of Marchesa Brigida Spinola-Doria, 1606. The sitter is Maria Serra Pallavicino, wife of Nicolò Pallavicino, who was host to Vincenzo Gonzaga, Duke of Mantua, in that year. Rubens was on the Duke’s paylist, and the portrait was probably a present.
By 1780, when it was listed in Ratti’s guide to Genoa, the identity of the sitter had been forgotten. It was later acquired by the Grimaldi family, and believed to be a portrait of Isabella Grimaldi. In 1840, it was bought by an English collector and is now at the Kingston Lacy Estate, Dorset. You can find more details on the description page of the National Trust.