He was born of parents altogether obscure and indigent, who supported themselves by their daily labour; his father of the same name with himself, his mother called Fulcinia. He had spent a considerable part of his life before he saw and tasted the pleasures of the city; having passed previously in Cirrhaeaton, a village of the territory of Arpinum, a life, compared with city delicacies, rude and unrefined, yet temperate, and conformable to the ancient Roman severity. He first served as a soldier in the war against the Celtiberians, when Scipio Africanus besieged Numantia; where he signalized himself to his general by courage far above his comrades, and particularly by his cheerfully complying with Scipio's reformation of his army, being almost ruined by pleasures and luxury. It is stated, too, that he encountered and vanquished an enemy in single combat, in his general's sight. In consequence of all this he had several honours conferred upon him; and once when at an entertainment a question arose about commanders, and one of the company (whether really desirous to know, or only in complaisance)asked Scipio where the Romans, after him, should obtain such another general, Scipio, gently clapping Marius on the shoulder as he sat next him, replied, "Here, perhaps." So promising was his early youth of his future greatness, and so discerning was Scipio to detect the distant future in the present first beginnings. It was this speech of Scipio, we are told, which, like a divine admonition, chiefly emboldened Marius to aspire to a political career. He sought, and by the assistance of Caecilius Metellus, of whose family he as well as his father were dependents, obtained the office of tribune of the people. In which place, when he brought forward a bill for the regulation of voting, which seemed likely to lessen the authority of the great men in the courts of justice, the consul Cotta opposed him, and persuaded the senate to declare against the law, and called Marius to account for it. He, however, when this decree was prepared, coming into the senate, did not behave like a young man newly and undeservedly advanced to authority, but, assuming all the courage that his future actions would have warranted, threatened Cotta, unless he recalled the decree, to throw him into prison. And on his turning to Metellus, and asking his vote, and Metellus, rising up to concur with the consul, Marius, calling for the officer outside, commanded him to take Metellus into custody. He appealed to the other tribunes, but not one of them assisted him; so that the senate, immediately complying, withdrew the decree. Marius came forth with glory to the people and confirmed his law, and was henceforth esteemed a man of undaunted courage and assurance, as well as a vigorous opposer of the senate in favour of the commons. But he immediately lost their opinion of him by a contrary action; for when a law for the distribution of corn was proposed, he vigorously and successfully resisted it, ****** himself equally honoured by both parties, in gratifying neither, contrary to the public interest.
After his tribuneship, he was candidate for the office of chief aedile; there being two orders of them, one the curules, from the stool with crooked feet on which they sat when they performed their duty; the other and inferior, called aediles of the people. As soon as they have chosen the former, they give their voices again for the latter. Marius, finding he was likely to be put by for the greater, immediately changed and stood for the less; but because he seemed too forward and hot, he was disappointed of that also. And yet though he was in one day twice frustrated of his desired preferment (which never happened to any before), yet he was not at all discouraged, but a little while after sought for the praetorship and was nearly suffering a repulse, and then, too, though he was returned last of all, was nevertheless accused of bribery.
Cassius Sabaco's servant, who was observed within the rails among those who voted, chiefly occasioned the suspicion, as Sabaco was an intimate friend of Marius; but on being called to appear before the judges, he alleged, that being thirsty by reason of the heat, he called for cold water, and that his servant brought him a cup, and as soon as he had drunk, departed; he was, however, excluded from the senate by the succeeding censors, and not undeservedly either, as was thought, whether it might be for his false evidence, or his want of temperance. Caius Herennius was also cited to appear as evidence, but pleaded that it was not customary for a patron (the Roman word for protector) to witness against his clients, and that the law excused them from that harsh duty; and both Marius and his parents had always been clients to the family of Herennii. And when the judges would have accepted of this plea, Marius himself opposed it, and told Herennius, that when he was first created magistrate he ceased to be his client; which was not altogether true. For it is not every office that frees clients and their posterity from the observance due to their patrons, but only those to which the law has assigned a curule chair. Notwithstanding, though at the beginning of the suit it went somewhat hard with Marius, and he found the judges no way favourable to him, yet at last, their voices being equal, contrary to all expectation, he was acquitted.