5. Cn.Manlius, tribune of the plebs B. C. 58, brought forward a law granting to the freedmen (libertini) the right of voting in all the tribes; but he was prevented from passing it by Domitius Ahenobarbus, who was then praetor (Ascon. in Cic. Mil. p. 46). Baiter, in his note on Asconius (l.c.), has shown that this Cn. Manlius is a different person from C. Manilius, who was tribune in B. C. 66. and who brought forward a similar law. [MANILIUS, No. 7.]
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890