I found this recipe in Libro novo nel qual s’insegna il modo d’ordinar banchetti – A new book on how to give banquets – by Christoforo di Messisbugo, who in the sixteenth century was steward to the Dukes d’Este of Ferrara, one of the great Renaissance families. In this splendid dish Messisbugo uses the sole from the nearby Adriatic, which have a unique and delicate flavour.