Iberian DNA: Rome's mark survived the Visigoths

Rome changed Iberian DNA and the Visigoths did not reverse it

What remains of Rome in the DNA of a Spaniard? A large genetic study of the Iberian region between the 1st and 8th centuries, using material from more than 200 skeletons, argues that the imprint of Roman Hispania endured after the arrival of the Suebi and the Visigoths. The central conclusion is that the Germanic peoples did not replace the local population. So far, nothing a history textbook wouldn't already whisper.

The problem appears when you look at the detail. The linked article itself points out that the genetic makeup of the Late Empire and the Roman Empire does not resemble the rest of the periods of our history, either before or after. In other words: the population of Hispania was more homogeneous before and after Rome than during Rome. And there opens the uncomfortable question. Why?

Two graves do not make a genetic census

The harshest criticism falls on the basis of the finding. Very few conclusions can be drawn from two related burials, and it has little to do with what the majority genetic stock may have been. The headline sells a revolution; the method, for now, offers a clue. It is the old temptation to turn a laboratory anecdote into a thesis about civilization.

On the role of the Germanic peoples, the consensus is broad: they did not replace the local population. By the 8th century there was no legal or institutional separation between natives and Goths. There were Hispano-Roman generals in high positions, and the best general the Gothic kingdom ever had was Hispano-Roman. He served the Arian Leovigild against the rebellion of the Catholic Hermenegild. That gives an idea of how far the dichotomy of invading peoples versus natives had faded.

The Reconquista as an ethnic conflict, not only religious

The leap to the 8th century comes quickly. Some argue that the Sarracinic conquest is the key ethnogenesis event in Spain, the one that created the Spanish people as we know them today. Without that irruption, there might perhaps have been greater segregation between natives and Goths. Against this weighs the nuance that Sarracinic societies were tribal and multiethnic: there were periods when the Andalusi armies were mostly slaves or Berber mercenaries, because local leaders were not enough.

The harshest reading frames the Reconquista as an ethnic conflict as well as a religious one. Hispanic populations facing each other for almost a millennium, with foreign elites on both sides —Visigoths and Franks on one side, Arabs and Berbers on the other— over a base of local population. The underlying thesis: Semitic religions, foreign elites, the same human substrate underneath.

The Italian parallel that dismantles exceptionalism

The geographic contrast serves as a test. There was an emirate in Sicily and several small ones in southern Italy; in the 9th century the Arabs even laid siege to Rome. The result, it is argued, was the same as in Hispania: Sarracin was eradicated at the root. The difference is one of degree, not of nature. Where a population becomes Sarracinized, reversing it requires annihilation or expulsion, and that leaves a genetic mark.

The conclusion that floats over all the material is less epic than it seems. Rome left a mark, the Germanic peoples were minority elites, and the great demographic rupture came later. The study provides 200 skeletons and a headline; the real history is still being debated at the margins.