The praenomen (Classical Latin: [ˈprae̯:.noː.mɛn]; plural: praenomina) was a personal name chosen by the parents of a Roman child. It was first bestowed on the dies lustricus (day of lustration), the eighth day after the birth of a girl, or the ninth day after the birth of a boy. The praenomen would then be formally conferred a second time when girls married, or when boys assumed the toga virilis upon reaching manhood. Although it was the oldest of the tria nomina commonly used in Roman naming conventions, by the late republic, most praenomina were so common that most people were called by their praenomina only by family or close friends. For this reason, although they continued to be used, praenomina gradually disappeared from public records during imperial times. Although both men and women received praenomina, women's praenomina were frequently ignored, and they were gradually abandoned by many Roman families, though they continued to be used in some families and in the countryside.
The tria nomina, consisting of praenomen, nomen and cognomen, which are today regarded as a distinguishing feature of Roman culture, first developed and spread throughout Italy in pre-Roman times. Most of the people of Italy spoke languages belonging to the Italic branch of the Indo-European language family; the three major groups within the Italian Peninsula were the Latino-Faliscan languages, including the tribes of the Latini, or Latins, who formed the core of the early Roman populace, and their neighbors, the Falisci and Hernici; the Oscan languages, including the Sabines, who also contributed to early Roman culture, as well as the Samnites, and many other peoples of central and southern Italy; and the Umbrian languages, spoken by the Umbri of the Po Valley, the rustic Picentes of the Adriatic coast, and the Volsci.