Engineer Isaac Moreno Gallo challenges Roman heritage claims in Spain

Engineer Isaac Moreno Gallo challenges Roman heritage claims in Spain

How many of the structures sold by tourist signs as Roman actually are? This is the question at the heart of every video by Isaac Moreno Gallo, a trained engineer and dedicated science communicator. Many first discovered him through La 2 documentaries on Roman hydraulic engineering, and he has since built a massive YouTube trinc with his deep dives into topography, aqueducts, roads, and dams. While his material is not new—backed by years of research and events like the VII International Congress of Roman Engineering in Zaragoza—the conversation he sparks remains vibrant and increasingly uncomfortable for the academic community.

His central thesis is controversial: a significant portion of the official catalog of Roman public works in Spain is misattributed, not due to bad faith, but because of academic laziness. The most cited case is the supposed road at the El Pico port, whose documentation in the Ávila historical archive places it in 1819, under Fernando VII. The Talavera bridge, labeled as Roman for decades, has collapsed. And what was presented as the longest dam in the Empire is, according to his analysis, neither Roman nor exactly a dam.

The business of error: how many Roman roads are not

This is where the debate begins. Some claim that barely 15% of the roads officially cataloged as Roman actually are, a figure thrown around without documentary support that Moreno Gallo himself has never formulated in those exact terms. Against this stands an elementary argument: not all Roman roads were paved with stone slabs on embankments, so the absence of paving does not invalidate the attribution. The discussion, therefore, moves between the legitimate denunciation of specific errors and the temptation to turn error into a systemic rule.

What is documented to exhaustion is the massive use of slave labor in mines, quarries, and public works. Imperial mining districts functioned as enclaves exploited under military control, and *damnatio ad metalla* (a punishment involving forced labor in the mines) appears in sources with an insistence that makes it hard to claim slavery was a cinematic myth. Moreno Gallo adds nuance: high-precision civil works required highly skilled and well-paid specialists, and Anglo-Saxon cinema has built a caricatured image of ancient labor. Both can be true at once, and that is exactly the nuance lost in the trenches.

Recópolis, the Visigoths, and the problem of chronology

The second front is Visigothic architecture. Some argue that much of the catalog attributed to the Visigoths is actually Andalusi (Sarracinic Spain) or even from the 11th century, and that accumulated archaeology—Visigothic coinage, the absence of Andalusi strata, and dated artistic styles—does not support this revision. Recópolis is a deserted site with genuine Visigothic remains, not Andalusi, and the churches under doubt do not appear in urban contexts with overlapping layers that could confuse a researcher.

The underlying criticism is significant: when an engineer ventures into historical chronology without the professional documentary apparatus, the result can be as valuable as it is reckless. A veteran archaeologist consulted on the matter notes that Moreno Gallo presents conclusions researched by others without citing the original source, and that he has defended theses at certain conferences that he does not personally share. It is not a personal attack: it is the old tension between the technical expert who sees what the academic does not, and the academic who demands the method that the technician does not always apply.

Las Médulas and the impossible theodolite

Consensus breaks down entirely regarding technology. The description of Las Médulas provided by the communicator speaks of 800 kilometers of canals, with the longest stretch covering 154 kilometers, involving water transfers between the Duero and Miño basins. It is a figure that dwarfs any urban aqueduct and explains why the *ruina montium* (the technique of mountain destruction) continues to fascinate. The objection comes from elsewhere: claiming that the Romans possessed measurement instruments almost identical to the mechanical theodolites that did not appear until the 16th and 17th centuries is, for much of the professional community, a hypothesis without valid proof. Roman technology was formidable, but there is a vast gap between that and inventing modern instrumentation.

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The paradox is fascinating: an engineer who corrects historians in their own field, and whom historians correct in his. Every new video reopens the same uncomfortable question, and every answer leaves the score exactly where it was. Meanwhile, the Talavera bridge remains on the ground.