But opposition and difficulties sprang up in her own family. In 39 B.C. Augustus had had by Scribonia a daughter, Julia. Following in the government of his family, as in so large a part of his politics, the traditions of the old nobility, Augustus gave his daughter in marriage when very young,--she was not yet past seventeen,--just as he early gave wives to Livia's two sons, whose guardian he was. In each case in order to assure within his circle harmony and power, he chose the consort in his own family or from among his friends. To Tiberius he gave Agrippina, a daughter of Agrippa, his close friend and most faithful collaborator; to Drusus he gave Antonia, the younger daughter of Mark Antony and Octavia, sister of Augustus. To Julia he gave Marcellus, his nephew, the son of Octavia and her first husband. But while the marriages of Drusus and Tiberius proved successful and the two couples lived lovingly and happily, such was not the case with the marriage of Julia and Marcellus. As a result, disagreeable misunderstandings and rancors soon made themselves felt in the family. We do not know exactly what were the causes of these disagreements. It seems that Marcellus, under the influence of Julia, assumed a tone somewhat too haughty and insolent, such as was not becoming in a youth who, although the nephew of Augustus, was still taking his first steps in his political career; and it seems too that this conduct of his was especially offensive to Agrippa, who, next to Augustus, was the first person in the empire.