That’s what this article (link to article) claims about the Faddan More Psalter. The article reports that about 15 percent of the text has survived the supermillenial bog burial. I think the claim is somewhat exaggerated, though doubtless one would never have expected to find such an item in a bog, nor would one ever hope to find such an item in a bog again. The text provides a valuable early testimony to the transmission of the Latin text.

– TurretinFan