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Saavedra's Idea de un príncipe político cristiano ("The Idea of a Christian political prince", 1640) was a very erudite work that uses the literary sort of emblem, put by Andrea Alciato with his Emblemata translated in 1549 and that has a mainly moral and philosophical character.
According to Francisco-Xavier de Salas Bosch, Goya may have been referencing an allegory (number 75) that appears in the work by Diego de Saavedra Fajardo, the emblem book Empresas Políticos Political Maxims, Idea de un príncipe político cristiano, which contained a hundred short essays on the education of a prince.