of older praenomina and their meanings. Most praenomina were regularly abbreviated, and rarely written in full. Other praenomina were used by the Oscan, Umbrian, and Etruscan-speaking peoples of Italy, and many of these also had regular abbreviations. Lists of praenomina used by the various people of Italy, together with their usual abbreviations, can be found at praenomen. Roman men were usually known by their praenomina to members of their family and household, clientes and close friends; but outside of this circle, they might be called by their nomen, cognomen, or any combination of praenomen, nomen, and cognomen that was sufficient to distinguish them from other men with similar names. In the literature of the Republic, and on all formal occasions, such as when a senator was called upon to speak, it was customary to address a citizen by praenomen and nomen; or, if this were insufficient to distinguish him from other members of the gens, by praenomen and cognomen. In imperial times, the praenomen became increasingly confused by the practices of the aristocracy. The emperors usually prefixed Imperator to their names as a praenomen, while at the same time retaining their own praenomina; but because most of the early emperors were legally adopted by their predecessors, and formally assumed new names, even these were subject to change. Several members of the Julio-Claudian dynasty exchanged their original praenomina for cognomina, or received cognomina in place of praenomina at birth. An emperor might emancipate or enfranchise large groups of people at once, all of whom would automatically receive the emperor's praenomen and nomen. Yet another common practice beginning in the first century AD was to give multiple sons the same praenomen, and distinguish them using different cognomina; by the second century this was becoming the rule, rather than the exception. Another confusing practice was the addition of the full nomenclature of maternal ancestors to the basic tria nomina, so that a man might appear to have two praenomina, one occurring in the middle of his name. Under the weight of these practices and others, the utility of the praenomen to distinguish between men continued to decline, until only the force of tradition prevented its utter abandonment. Over the course of the third century, praenomina become increasingly scarce in written records, and from the fourth century onward their appearance becomes exceptional. The descendants of those who had been granted citizenship by the Constitutio