In this duel, what was the behaviour and the part of Livia, the mother of Tiberius? The ancient historians tell us nothing; it is, at all events, hardly probable that Livia remained an inactive witness of the long struggle waged to secure the return of Tiberius and his reinstatement in the brilliant position once his. Moreover, Suetonius says that during his entire stay at Rodi, Tiberius communicated with Augustus by means of Livia. At any rate, the party of Tiberius was not long in understanding that he could not re-enter Rome, as long as Julia was popular and most powerful there; that to reopen the gates of Rome to the husband, it was necessary to drive out the wife. This was a difficult enterprise, because Julia was upheld by the party already dominant; she had the affection of Augustus; she was the mother of Caius and Lucius Cæsar, the two hopes of the Republic, whose popularity covered her with a respect and a sympathy that made her almost invulnerable. Tiberius, instead, was unpopular. However, there is no undertaking impossible to party hate. Exasperated by the growing disfavour of public opinion, the party of Tiberius decided on a desperate expedient to which Tiberius himself would not have dared set hand; that is, since Julia had a paramour, to adopt against her the weapon supplied by the _lex Julia de adulteriis_, made by her father, and so provoke the terrible scandal that until then every one had avoided in fear. Unfortunately, we possess too few documents to write in detail the history of this dreadful episode; but everything becomes clear enough if one sees in the ruin of Julia a kind of terrible political and judicial blackmailing, tried by the friends of Tiberius to remove the chief obstacle to his return, and if one takes it that the friends of Tiberius succeeded in procuring proofs of the guilt of Julia and carried them to Augustus, not as to the head of the State, but to the father. Dion Cassius says that "Augustus finally, although tardily, came to recognise the misdeeds of his daughter," which signifies that at a given moment, Augustus could no longer feign ignorance of her sins, because the proofs were in the power of irreconcilable enemies, who would have refused to smother the scandal. These mortal enemies of Julia could have been no other than the friends of Tiberius. Julia had violated the law on adultery made by himself; Augustus could doubt it no more.