The apprehensions of Augustus were removed by the death of Marcellus in B. C. 23, and Agrippa immediately returned to Rome, where he was the more anxiously expected, as troubles had broken out during the election of the consuls in B. C. 21. Augustus resolved to receive his faithful friend into his own family, and accordingly induced him to divorce his wife Marcella, and marry Julia, the widow of Marcellus and the daughter of Augustus by his third wife, Scribonia. (B. C. 21.)
In B. C. 19, Agrippa went into Gaul.
He pacified the turbulent natives, and constructed four great public roads and a splendid aqueduct at Nemausus (Nîmes). From thence he proceeded to Spain and subdued the Cantabrians after a short but bloody and obstinate struggle; but, in accordance with his usual prudence, he neither announced his victories in pompous letters to the senate, nor did he accept a triumph which Augustus offered him. In B. C. 18, he was invested with the tribunician power for five years