Years before, as boys, he and Aulus Cornelius had sworn a blood oath which bound each to attend upon the other in time of need and to aid each other in pursuit of their careers, but Aulus had failed to support Lucius at a time when he should have been present, that being the birth of Lucius’s son Marcellus, on the night of the Feast of Lupercalia. Worse, with the whole edifice of empire in peril, an impious act, the bloody removal of a Plebeian Tribune, had been required to protect that imperium. Lucius looked to Aulus, of all people, for backing; his childhood friend had not met his obligations and neither had he offered an explanation for that failure, thus creating a suspicion that far from being a partisan of the faction that Lucius led, the Optimates, he had joined the ranks of his enemies, the Populares. Bad as that was, it was not as troubling at that which followed; Aulus, in front of the whole Senate, having defended Lucius against an accusation of murder, had gone on to declare himself independent of all factions. He had deserted Lucius and the Patrician cause at the very time when his support was vital to success.

Angry and hurt, Lucius had allowed a spy to be placed in the Cornelii house — indeed the slave was still in place — the aim to ensure that Aulus was a passive not an active enemy. Thoas, a tall and handsome Numidian, had been conjoined with Claudia’s handmaiden, which put him very close to the centre of the household and even closer to the lady herself, and it transpired that it was she who was the key to the mystery of Aulus’s failure to attend and say prayers at the birth of his son. It had taken several years to unearth, but eventually the truth emerged, now all written up in a scroll that Lucius kept locked in his strongbox, and if it vindicated Aulus from any hint of conspiracy, it did nothing to raise him in the estimation of the man he had failed.