Castiglione’s most celebrated achievement was his authorship of the Libro del cortegiano. He worked on the text over many years, finally publishing it only a year before his death in Venice in 1528. This is the title page of the first edition.
Baldassare Castiglione, Il libro del cortegiano (Venice: Aldo Manuzio and Andrea Torresano, 1528), title page. Cambridge University Library, F152.b.2.5.