and was afterward one of the two first consuls of the new Roman Republic in 509 BC, taking the opportunity also to have the people swear an oath never to have a king in Rome. Brutus' homonymous father was tribune of the plebs in 83 BC, but he was killed by Pompey in 77 while serving as legate in the rebellion of Marcus Aemilius Lepidus. He had married Servilia of the Servilii Caepiones who was the half-sister of Cato the Younger, and later Julius Caesar's mistress. Some ancient sources refer to the possibility of Caesar being Brutus' real father, despite Caesar being only fifteen years old when Brutus was born. Ancient historians were sceptical of this possibility and "on the whole, scholars have rejected the possibility that Brutus was the love-child of Servilia and Caesar on the grounds of chronology". A relative of Brutus, Quintus Servilius Caepio, adopted him posthumously around 59 BC, and Brutus was known officially as Quintus Servilius Caepio Brutus, though he hardly used his legal name. In 59, when Caesar was consul, Brutus also was implicated by Lucius Vettius in the Vettius affair as a member of a conspiracy plotting to assassinate Pompey in the forum. Vettius was detained for admitting possession of a weapon within the city, and quickly changed this entire story, dropping Brutus' name from his accusations. Brutus' first appearance in public life was as an assistant to Cato, when the latter was appointed by the senate acting at the bequest of Publius Clodius Pulcher, as governor of Cyprus in 58. According to Plutarch, Brutus was instrumental in assisting the administration of the province (specifically by converting treasure of the former king of the island into usable money); his role in administering the province, however, has "almost certainly been exaggerated". Triumvir monetalis In 54 BC, Brutus served as triumvir monetalis, one of the three men appointed annually for producing coins, even though only another colleague is known: Quintus Pompeius Rufus. Moneyers in Brutus' day frequently issued coins commemorating their ancestors; Pompeius Rufus thus put the portraits of his two grandfathers (the dictator Sulla and Pompeius Rufus) on his denarii. Brutus, like his colleague, designed a denarius with the portraits of his paternal ancestor Lucius Junius Brutus and maternal ancestor Gaius Servilius Ahala, both of whom were widely recognised in the late Republic as defenders of liberty (for, respectively, expelling the kings and killing