 Later inscriptions commemorating the early centuries of the Republic supply these missing surnames, although the authenticity of some of them has been disputed.Under the Empire, however, the cognomen acquired great importance, and the number of cognomina assumed by the Roman aristocracy multiplied exponentially.Adding to the complexity of aristocratic names was the practice of combining the full nomenclature of both one's paternal and maternal ancestors, resulting in some individuals appearing to have two or more complete names.