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Radiocarbon Dating of the Sudarium of Oviedo

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The Sudarium of Oviedo is a bloodstained linen cloth kept by the cathedral chapter of San Salvador in Oviedo and venerated as the face cloth laid over Jesus after the crucifixion. Radiocarbon testing of the cloth returned a date in the region of the seventh century AD, long after the period the tradition claims for it. The laboratory entered a caveat with its own result: the cloth had absorbed oils across centuries of handling and veneration, and contamination of that kind can shift a measured radiocarbon age. The finding has therefore never been treated as a settled determination of the cloth's antiquity, and no repeat assay on a decontaminated sample has been published. What the study established is that the question is open, not that it is answered.

Facts
Open Questions
Replication Status
Not repeated on a decontaminated sample. Nobody holds a position on what a clean measurement would give, which makes the cloth's age undetermined rather than disputed: the work was begun, it did not conclude, and it was not resumed. 2
Recorded as unknown rather than debated because there are no competing camps to read. There is a gap where an answer would be.
Test Result
A seventh century AD date, issued with the laboratory's own warning that oils absorbed by the cloth over centuries of veneration could distort the measurement. The number and the caveat were published together and the caveat has never been discharged. 2
The date is not in dispute as a measurement. What is undetermined is what it measures.
Method
Design
Radiocarbon assay of sampled material from the linen, of the same kind used on the Shroud of Turin. The measurement returned an approximate seventh century AD date for the sampled fibres. 2
Status
Current StatusSourced to the subject's own account
The cloth remains in the keeping of the cathedral chapter at Oviedo, which controls access to it. Any further testing depends on the custodian granting a sample. 1
Learn More
What Was Measured, and What the Caveat Said

The Sudarium of Oviedo is a bloodstained linen cloth kept by the cathedral chapter of San Salvador in Oviedo and venerated as the face cloth laid over Jesus after the crucifixion. Unlike the Shroud of Turin it carries no image, and the case made for it has always rested on the stains and on a documentary history claimed to run back to the seventh century.

Radiocarbon assay of sampled fibres returned a date in the region of the seventh century AD. Taken at face value that is a straightforward result and it is centuries too late for the tradition. The laboratory did not leave it at face value. It entered a caveat with the number: the cloth had absorbed oils across a very long history of handling and public veneration, and organic contamination of that kind can shift a measured radiocarbon age, because the assay dates the carbon in the sample rather than the object the sample came from.

That caveat is the whole difficulty. Contamination by younger carbon pulls a date forward, so a genuinely older cloth could in principle measure younger, and nobody has established how much younger this particular contamination is capable of making it. The direction of the possible error is known. The size is not.

The result was therefore published as a measurement rather than as a determination, and no repeat assay on a decontaminated sample has appeared since to close the gap.

Why This Sits as Unknown Rather Than Disputed

It is tempting to file this beside the Shroud of Turin, where the 1988 radiocarbon result produced two settled camps arguing about sampling, repair and reweaving, with a literature on each side that a reader can go and read. The Sudarium is not that. There are no camps, because there is no second position to hold. There is one measurement, published with its own author's warning attached, and after it a silence.

The atlas marks that difference deliberately. A disputed claim is one where scholars have taken opposing views of the same evidence and defended them. An unknown is a place where somebody began the work, reached no conclusion, and stopped, and where nothing since has filled the gap. Recording the second as though it were the first would flatter the state of knowledge, because it would imply an argument that has not happened.

What would close it is not mysterious. A repeat assay on material cleaned by a published decontamination protocol, run blind across more than one laboratory, with the exact sampling location on the cloth recorded, and separately a characterisation of the absorbed contaminants to establish how large a shift they could produce. The obstacle is access rather than method: the cloth is held by a custodian who controls sampling, and the last assay is the reason a further one is delicate to ask for.

The atlas therefore carries an open question against this study rather than a conclusion, naming what would settle it and which discipline would have to do the settling.

Cross-Tradition Connections

Studied

Sudarium of Oviedo, Artifacts & Relics

Radiocarbon dating was attempted on the cloth; the result was compromised by suspected oil contamination.

Source The Oviedo ClothMark Guscin
Sources
1. The Sudarium and the Arca Santa - Cathedral of San Salvador, Oviedo
Cabildo de la Catedral de Oviedo, Catedral de Oviedothe holders' own accountView the Source
2. The Oviedo Cloth
Mark Guscin, Lutterworth Press, 1998View the Source
Open Questions (1 open question)
Would a radiocarbon assay of the Sudarium of Oviedo on a decontaminated sample give a different age from the seventh century AD result already published?

The published assay came with the laboratory's own caveat that oils absorbed over centuries of veneration could distort the measured age, and that caveat was never tested. No scholar holds a position on what a clean measurement would show, so this is a gap rather than a disagreement: the work was started, it reached no conclusion, and nobody resumed it.

What would resolve this A repeat assay on material cleaned by a published decontamination protocol, run blind across more than one laboratory, with the sampling location on the cloth recorded. Independent characterisation of the absorbed organic contaminants would show how large a shift they are capable of producing, which is the part the original caveat left unquantified.
Radiocarbon dating and archaeometry, with textile conservation science for the decontamination protocol.Mark Guscin, The Oviedo Cloth
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The atlas records no dated fact of its own for this entry, so there is no other year to choose.