de bello gallico, 1.3

Influenced by these things and very moved by the authority of Orgetorix, they decided to prepare those things which related to departure, to buy as great a number as possible of mules and cart, to sow as much seed as possible to provide a supply of grain on the journey, to confirm peace and friendship with the neighboring states. For the accomplishment of these things they considered two years enough for themselves: they set by law their departure in the third year. Orgetorix was chosen for the accomplishment of these things. This man took up for himself the legation to the states. In this journey he persuaded the Sequanus Casticus, son of Catamantaloedis, whose father had held kingship among the Sequani for many years and had been called a friend by the senate of the people of Rome, to take the kingship in his state which his father had held before; and likewise he persuaded the Aeduus Dumnorix, brother of Diviciacus, who at this time was holding the principate in his state and was most well-liked by the plebs, to try (to do) the same, and he gave him his daughter in marriage. He showed them that it was a very easy thing to do to accomplish these attempts, on account of the fact that he himself would obtain the power of his own state; there was no doubt but that the Helvetii were the most powerful of all Gaul; he confirmed that he would buy for them (i.e. unite with them) their kingdoms with his troops and army. Influenced by this speech, they gave faith among themselves and sworn oaths, and, with power having been gained, they hoped that they would be able to gain possession of all Gaul through (these) three most powerful and strong peoples.