A Congress of Animals; 1641-1710; Pen and brown ink; brush and watercolor; over traces of black chalk; 8 1/8 x 12 1/8in. (20.7 x 30.8cm); Drawings; Giovanni Francesco Castiglione (Italian; Genoa 1641-1710 Genoa); The graphic oeuvre of the elusive Francesco Castiglione; son and assistant of Giovanni Benedetto (1609-1664); can be based largely on the name annotated at the bottom of the sheet by a late-eighteenth-century collector known as the 'Reliable Venetian Hand' for the accuracy of his attributions