Agrippina also proposed to unite her son Domitius with Octavia the daughter of Claudius; but here there was a difficulty also, for Octavia was betrothed to L. Silanus. Again, however, she found a ready tool in the base Vitellius, to whose son Julia Calvina, the sister of Silanus, had been married. As the brother and sister indulged their affection imprudently, though not improperly, the worthy censor took the occasion to make a charge of incest against Silanus, and to strike him out of the list of senators. Claudius then broke off the match, and Silanus put an end to himself on the very day of Agrippina’s marriage. His sister was banished, and Claudius ordered some ancient rites expiatory of incest to be performed, unconscious of the application of them which would be made to himself. The woman, who had now obtained the government of Claudius and the Roman Empire, was of a very different character from the abandoned Messallina. The latter had nothing noble about her, she was the mere bondslave of lust, and cruel and avaricious only for its gratification; but Agrippina was a woman of superior mind, though utterly devoid of principle. In her, lust was subservient to ambition; it was the desire of power or the fear of death, and not wantonness, that made her submit to the incestuous embraces of her brutal brother Caligula, and to be prostituted to the companions of his vices. It was ambition and parental love that made her now form an incestuous union with her uncle. To neither of her husbands, Cn. Domitius or Crispus Passienus, does she appear to have been voluntarily unfaithful. The bed of Claudius was, however, not fated to be unpolluted; for as a means of advancing her views, Agrippina formed an illicit connection with Pallas. [Sidenote: [49-54 A.D.]] The great object of Agrippina was to exclude Britannicus, and obtain the succession for her own son Nero Domitius, now a boy of twelve years of age. She therefore caused Octavia to be betrothed to him, and she had the philosopher Seneca recalled from Corsica, whither he had been exiled by the arts of Messallina, and committed to him the education of her son, that he might be fitted for empire. In the following year Claudius, yielding to her influence, adopted him. [Illustration: RUINS OF THE AQUEDUCT OF CLAUDIUS]