If the consulship were not absolutely closed to the plebeians before the decemvirate, all historical sources agree that it was when Marcus Genucius was consul in 445.
[ii][1][4] Plebeian Genucii appear as early as 476 BC, when a Titus Genucius was tribune of the plebs.
[1] The Genucii of the Republic favoured the praenomina Lucius, Titus, Marcus, and Gnaeus, all of which were very common throughout Roman history.
This apparent inconsistency would be avoided if the Fasti mistakenly assigned him the surname Augurinus instead of Aventinensis, which was the name of a plebeian family of the Genucii.
[8][iii] They might have been descended from the Aventinenses, since the two Clepsinae share the filiation "L. f. L. n."; they could have been the sons of Lucius Genucius Aventinensis, consul in 303 BC.