Throughout all Gaul there are two orders of those men who are of any rank and dignity: for the commonality is held almost in the condition of slaves, and dares to undertake nothing of itself, and is admitted to no deliberation. The greater part, when they are pressed either by debt, or the large amount of their tributes, or the oppression of the more powerful, give themselves up in vassalage to the nobles, who possess over them the same rights without exception as masters over their slaves. But of these two orders, one is that of the Druids, the other that of the knights. The former are engaged in things sacred, conduct the public and the private sacrifices, and interpret all matters of religion. To these a large number of the young men resort for the purpose of instruction, and they [the Druids] are in great honor among them. For they determine respecting almost all controversies, public and private; and if any crime has been perpetrated, if murder has been committed, if there be any dispute about an inheritance, if any about boundaries, these same persons decide it; they decree rewards and punishments; if any one, either in a private or public capacity, has not submitted to their decision, they interdict him from the sacrifices. This among them is the most heavy punishment. Those who have been thus interdicted are esteemed in the number of the impious and the criminal: all shun them, and avoid their society and conversation, lest they receive some evil from their contact; nor is justice administered to them when seeking it, nor is any dignity bestowed on them. Over all these Druids one presides, who possesses supreme authority among them. Upon his death, if any individual among the rest is pre-eminent in dignity, he succeeds; but, if there are many equal, the election is made by the suffrages of the Druids; sometimes they even contend for the presidency with arms. These assemble at a fixed period of the year in a consecrated place in the territories of the Carnutes, which is reckoned the central region of the whole of Gaul. Hither all, who have disputes, assemble from every part, and submit to their decrees and determinations. This institution is supposed to have been devised in Britain, and to have been brought over from it into Gaul; and now those who desire to gain a more accurate knowledge of that system generally proceed thither for the purpose of studying it.
The Druids do not go to war, nor pay tribute together with the rest; they have an exemption from military service and a dispensation in all matters. Induced by such great advantages, many embrace this profession of their own accord, and [many] are sent to it by their parents and relations. They are said there to learn by heart a great number of verses; accordingly some remain in the course of training twenty years. Nor do they regard it lawful to commit these to writing, though in almost all other matters, in their public and private transactions, they use Greek characters. That practice they seem to me to have adopted for two reasons; because they neither desire their doctrines to be divulged among the mass of the people, nor those who learn, to devote themselves the less to the efforts of memory, relying on writing; since it generally occurs to most men, that, in their dependence on writing, they relax their diligence in learning thoroughly, and their employment of the memory. They wish to inculcate this as one of their leading tenets, that souls do not become extinct, but pass after death from one body to another, and they think that men by this tenet are in a great degree excited to valor, the fear of death being disregarded. They likewise discuss and impart to the youth many things respecting the stars and their motion, respecting the extent of the world and of our earth, respecting the nature of things, respecting the power and the majesty of the immortal gods.
– Gaius Julius Cæsar, De Bello Gallico, Book 6, Chapters 13 & 14.
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13. In omni Gallia eorum hominum, qui aliquo sunt numero atque honore, genera sunt duo. Nam plebes paene servorum habetur loco, quae nihil audet per se, nullo adhibetur consilio. Plerique, cum aut aere alieno aut magnitudine tributorum aut iniuria potentiorum premuntur, sese in servitutem dicant nobilibus: in hos eadem omnia sunt iura, quae dominis in servos. Sed de his duobus generibus alterum est druidum, alterum equitum. Illi rebus divinis intersunt, sacrificia publica ac privata procurant, religiones interpretantur: ad hos magnus adulescentium numerus disciplinae causa concurrit, magnoque hi sunt apud eos honore. Nam fere de omnibus controversiis publicis privatisque constituunt, et, si quod est admissum facinus, si caedes facta, si de hereditate, de finibus controversia est, idem decernunt, praemia poenasque constituunt; si qui aut privatus aut populus eorum decreto non stetit, sacrificiis interdicunt. Haec poena apud eos est gravissima. Quibus ita est interdictum, hi numero impiorum ac sceleratorum habentur, his omnes decedunt, aditum sermonemque defugiunt, ne quid ex contagione incommodi accipiant, neque his petentibus ius redditur neque honos ullus communicatur. His autem omnibus druidibus praeest unus, qui summam inter eos habet auctoritatem. Hoc mortuo aut si qui ex reliquis excellit dignitate succedit, aut, si sunt plures pares, suffragio druidum, nonnumquam etiam armis de principatu contendunt. Hi certo anni tempore in finibus Carnutum, quae regio totius Galliae media habetur, considunt in loco consecrato. Huc omnes undique, qui controversias habent, conveniunt eorumque decretis iudiciisque parent. Disciplina in Britannia reperta atque inde in Galliam translata esse existimatur, et nunc, qui diligentius eam rem cognoscere volunt, plerumque illo discendi causa proficiscuntur.
14. Druides a bello abesse consuerunt neque tributa una cum reliquis pendunt; militiae vacationem omniumque rerum habent immunitatem. Tantis excitati praemiis et sua sponte multi in disciplinam conveniunt et a parentibus propinquisque mittuntur. Magnum ibi numerum versuum ediscere dicuntur. Itaque annos nonnulli vicenos in disciplina permanent. Neque fas esse existimant ea litteris mandare, cum in reliquis fere rebus, publicis privatisque rationibus Graecis litteris utantur. Id mihi duabus de causis instituisse videntur, quod neque in vulgum disciplinam efferri velint neque eos, qui discunt, litteris confisos minus memoriae studere: quod fere plerisque accidit, ut praesidio litterarum diligentiam in perdiscendo ac memoriam remittant. In primis hoc volunt persuadere, non interire animas, sed ab aliis post mortem transire ad alios, atque hoc maxime ad virtutem excitari putant metu mortis neglecto. Multa praeterea de sideribus atque eorum motu, de mundi ac terrarum magnitudine, de rerum natura, de deorum immortalium vi ac potestate disputant et iuventuti tradunt.
— C. Iuli Cæsaris, Commentariorum de Bello Gallico, Liber Sextus, xiii & xiv.