In 63 a tribune, Titus Labienus, prosecuted the elderly optimate senator Gaius Rabirius for the killing, 37 years previously, of the populist tribune Lucius Appuleius Saturninus, who had been declared a public enemy by the Senate after a candidate for the consulship had been murdered during an election.
The same year, Caesar ran for election to the post of Pontifex Maximus, chief priest of the Roman state religion, after the death of Quintus Caecilius Metellus Pius, who had been appointed to the post by Sulla.