About the same time he married Calpurnia, the daughter of Lucius Piso, who was to succeed him in the consulship, and gave his own daughter Julia to Cneius Pompey; rejecting Servilius Caepio, to whom she had been contracted, and by whose means chiefly he had but a little before baffled Bibulus. After this new alliance, he began, upon any debates in the senate, to ask Pompey's opinion first, whereas he used before to give that distinction to Marcus Crassus; and it was the usual practice for the consul to observe throughout the year the method of consulting the senate which he had adopted on the calends (the first) of January.

Being, therefore, now supported by the interest of his father-in-law and son-in-law, of all the provinces he made choice of Gaul, as most likely to furnish him with matter and occasion for triumphs. At first indeed he received only Cisalpine-Gaul,Gaul was divided into two provinces, Transalpina, or Gallta Uterior, and Cisalpina, or Citerior. The Citerior, having nearly the same limits as Lombardy in after times, was properly a part of Italy, occupied by colonists from Gaul, and, having the Rubicon, the ancient boundary of Italy, on the south. It was also called Gallia Togata, from the use of the Roman toga; the inhabitants being, after the social war, admitted to the right of citizens. The Gallia Transalpina, or Ulterior, was called Comata, from the people wearing their hair long, while the Romans wore it short; and the southern part, afterwards called Narbonensis, came to have the epithet Braccata, from the use of the braccae, which were no part of the Roman dress. Some writers suppose the braccae to have been breeches, but Aldus, in a short disquisition on the subject, affirms that they were a kind of upper dress. And this opinion seems to be countenanced by the name braccan being applied by the modern Celtic nations, the descendants of the Gallic Celts, to signify their upper garment, or plaid. with the addition of Illyricum, by a decree proposed by Vatinius to the people; but soon afterwards obtained from the senate Gallia-Comata also, the senators being apprehensive, that if they should refuse it to him, that province, also, would be granted him by the people. Elated now with his success, he could not refrain from boasting, a few days afterwards, in a full senate-house, that he had, in spite of his enemies, and to their great mortification, obtained all he desired, and that for the future he would make them, to their shame, submissive to his pleasure. One of the senators observing, sarcastically: "That will not be very easy for a woman.Alluding, probably, to certain scandals of a gross character which were rife against Caesar. See before, c. ii. (p. 2). to do," he jocosely replied, "Semiramis formerly reigned in Assyria, and the Amazons possessed great part of Asia."

When the term of his consulship had expired, upon a motion being made in the senate by Caius Memmius and Lucius Domitius, the praetors, respecting the transactions of the year past, he offered to refer himself to the house; but they declining the business, after three days spent in vain altercation, he set out for his province. Immediately, however, his quaestor was charged with several misdemeanors, for the purpose of implicating Caesar himself. Indeed, an accusation was soon after preferred against him by Lucius Antistius, tribune of the people; but by making an appeal to the tribune's colleagues, he succeeded in having the prosecution suspended during this absence in the service of the state. To secure himself, therefore, for the time to come, he was particularly careful to secure the good-will of the magistrates at the annual elections, assisting none of the candidates with his interest, nor suffering any persons to be advanced to any office, who would not positively undertake to defend him in his absence: for which purpose he made no scruple to require of some of them an oath, and even a written obligation.

But when Lucius Domitius became a candidate for the consulship, and openly threatened that, upon his being elected consul, he would effect that which he could not accomplish when he was praetor, and divest him of the command of the armies, he sent for Crassus and Pompey to Lucca, a city in his province, and pressed them, for the purpose of disappointing Domitius, to sue again for the consulship, and to continue him in his command for five years longer: with both which requisitions they complied. Presumptuous now with his success, he added, at his own private charge, more legions to those which he had received from the republic; among the former of which was one levied in Transalpine Gaul, and called by a Gallic name, Alauda,So called from the feathers on their helmets, resembling the crest of a lark; Alauda, Fr. Alouette. which he trained and armed in the Roman fashion, and afterwards conferred on it the freedom of the city. From this period he declined no occasion of war, however unjust and dangerous; attacking, without any provocation, as well the allies of Rome as the barbarous nations which were its enemies: insomuch, that the senate passed a decree for sending commissioners to examine into the condition of Gaul; and some members even proposed that he should be delivered up to the enemy. But so great had been the success of his enterprises, that he had the honour of obtaining more days of supplication, Days appointed by the senate for public thanksgiving in the temples in the name of a victorious general, who had in the decrees the title of emperor, by which they were saluted by the legions. and those more frequently, than had ever before been decreed to any commander.

During nine years in which he held the government of the province, his achievements were as follows: he reduced all Gaul, bounded by the Pyrenean forest, the Alps, mount Gebenna, and the two rivers, the Rhine and the Rhone, and being about three thousand two hundred miles in compass, into the form of a province, excepting only the nations in alliance with the republic, and such as had merited his favour; imposing upon this new acquisition an annual tribute of forty millions of sesterces. He was the first of the Romans who, crossing the Rhine by a bridge, attacked the Germanic tribes inhabiting the country beyond that river, whom he defeated in several engagements. He also invaded the Britons, a people formerly unknown, and having vanquished them, exacted from them contributions and hostages. Amidst such a series of successes, he experienced thrice only any signal disaster; once in Britain, when his fleet was nearly wrecked in a storm; in Gaul, at Gergovia, where one of his legions was put to the rout; and in the territory of the Germans, his lieutenants Titurius and Aurunculeius were cut off by an ambuscade.