Critognatus: Caesar's Propaganda

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The main chapter reports, in section V, the extreme proposal made by the Arvernian Critognatus at the Alesia war council: to feed on those mouths judged useless in combat rather than surrender. This zoom questions the very nature of this source: what do we actually know about Critognatus, and why does his speech deserve particular caution?

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📖 A single, uncorroborated source

Critognatus’s speech is known from only one text: Caesar’s own Commentaries on the Gallic War, which reports an elaborate and rhetorically crafted version of it. No other ancient source, Gaulish or Roman, mentions this figure or this episode. This situation is nothing exceptional in Caesar’s work: historians have long described the Commentaries not as a history book in the modern sense, but as a work of political apologetics, written and circulated by Caesar himself to legitimize his conquest and his career before Roman public opinion.

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🎭 A precise rhetorical function

Several modern historians, including Michel Rambaud in his classic study of historical distortion in Caesar, point out that the speeches attributed to Gaulish chiefs in the Commentaries serve a precise narrative function more than they report words actually spoken. Critognatus’s speech, through its very extremism — the proposal of cannibalism against non-combatants —, serves to paint, by contrast, the savage desperation of the besieged, reinforcing the image of a disciplined Roman army and a legitimate Roman cause against a fanatical enemy. The fact that the war council ultimately chooses the scarcely less cruel option of expelling the Mandubii rather than following Critognatus takes nothing away from the speech’s function: it fixes, in the mind of the Roman reader, the measure of what the Gauls would have been willing to do.

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⚖️ A caution that does not change the material facts

This historiographical caution does not call into question the essential material facts reported for the siege of Alesia — the famine, the expulsion of the Mandubii, the final surrender are corroborated, at least in their broad outlines, by the site’s topography and by the archaeological remains of the siege works. It only invites a distinction, within Caesar’s account, between what counts as verifiable fact and what belongs to a literary staging aimed at a specific audience — a distinction already applied in this project to other episodes of this war, such as the capture of the Usipetes and the Tencteri, or Vercingetorix’s surrender itself.

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🧠 Key points

• Critognatus’s speech is attested only by Caesar himself; no other ancient source corroborates it.
• Modern historians regard the Commentaries on the Gallic War as a work of political propaganda as much as historical narrative.
• The speech, through its extremism, likely serves to underline Gaulish desperation and to implicitly legitimize the Roman cause for the reader of the time.
• This caution regarding the speeches does not invalidate the material facts of the siege of Alesia, otherwise corroborated by archaeology.