William Cecil’s interests in heraldry and genealogy, and his particular concern for the antiquity of his own pedigree, are well known, but it is often presented as a personal hobby. This paper explores the means by which William Cecil used printed heraldic treatises, kings of arms and even domestic decoration to make his private genealogical research public. Rather than using genealogical study as a refuge from the world, Cecil actively used print, the office of arms and architecture to publicise his pedigree far more widely than other new men who sought the legitimacy of antiquity.