 In 1991 Christiaan Schuckman discovered a set of signed plates in Madrid that can be attributed to the engraver of the First Folio portrait. These plates bear Droeshout's signature and are stylistically similar to his portrait of Shakespeare. (They include a portrait of the priest and writer Franciso de la Peña that has a striking resemblance to the English poet). On the evidence of these plates, which were made between 1635 and 1639, Schuckman attributed the portrait of Shakespeare to the younger Martin and suggested that the engraver had converted to Catholicism and emigrated to Spain in 1635, where he continued to work.
