Novus homo or homo novus was the term in ancient Rome for a man who was the first in his family to serve in the Roman Senate or, more specifically, to be elected as consul. When a man entered public life on an unprecedented scale for a high communal office, then the term used was novus civis or "new citizen".
Cicero
A consul was the highest elected public official of the Roman Republic. Romans considered the consulship the second-highest level of the cursus honorum—an ascending sequence of public offices to which politicians aspired—after that of the censor, which was reserved for former consuls. Each year, the Centuriate Assembly elected two consuls to serve jointly for a one-year term. The consuls alternated each month holding fasces when both were in Rome. A consul's imperium extended over Rome and all its provinces.
Gold coin from Dacia, minted by Coson, depicting a consul and two lictors
Image: Diptych of Honorius (body)
Image: Diptych of Constantius III