Although having failed once to be elected praetor, Livianus tried again, achieving the office by 81.[6] He ran for the office of consul in 77, achieving it only after Gaius Scribonius Curio withdrew his candidature for that year in favor of Livianus.[7] Neither Mamercus nor his consular colleague accepted a proconsular command in Hispania to help Quintus Caecilius Metellus Pius in the Sertorian War.[8] There is no evidence that he obtained a provincial command after his term was concluded.[9]
Following his term as consul Livianus was probably a promagistrate serving under Marcus Antonius Creticus in 74, who had been given an extraordinary commission to clear the Mediterranean Sea of pirates operating from Crete.[10] By 70, he may have been Princeps Senatus, although the evidence is inconclusive.[11] He was called as a hostile witness against Gaius Cornelius in 65, as part of the events surrounding the First Catilinarian Conspiracy.[12]
Family
Livianus had a daughter named Aemilia Lepida who was engaged to her cousin Cato for a time.[13]
^Although Livianus was listed first on the roll of the Senate for that year, much of the prominence attached to that position had been undermined by the Sullan reforms of a decade before, and that this was by now merely a technical term — see Broughton, pg. 126
^Broughton, The Magistrates of the Roman Republic, Vol III, pg. 7
^Syme, Ronald (2016). "Satellites of Sulla". In Santangelo, Federico (ed.). Approaching the Roman Revolution: Papers on Republican History (illustrated ed.). Oxford University Press. p. 113. ISBN9780198767060.
^Drogula, Fred K. (2019). Cato the Younger: Life and Death at the End of the Roman Republic. Oxford University Press. p. 34. ISBN9780190869045.