» For other uses, see Brutus (disambiguation). Brutus is a Roman cognomen used by several politicians of the Junii family, especially in the Roman Republic. The plural of Brutus is Bruti, and the vocative form is Brute, as immortalized in the quotation "Et tu, Brute?". Notable ancient Romans with this cognomen include: Marcus Junius Brutus— Caesar's friend and most famous assassin.Marcus Junius Brutus the Elder, the father of the aforementioned assassin.Lucius Junius Brutus — tradit… (More on Brutus)