An Ancient Cup, a Medieval Mount

Physical examination of the Valencia chalice separates cleanly into two different objects joined together: the plain agate cup itself is consistent with manufacture somewhere in the eastern Mediterranean or Near East around the first century BCE to first century CE, a genuinely ancient piece whatever its original use, while the ornate gold stem, handles and gemstones that mount it into a recognisable chalice shape are medieval additions, probably added centuries after the cup itself was carved. This means the object's antiquity and its identification as the Last Supper cup are two separate claims resting on different kinds of evidence, the first plausible on material grounds, the second entirely a matter of unbroken tradition back to the medieval Aragonese court with no earlier documentary trail connecting the cup to first century Jerusalem.

Valencia's claim also competes with several other European objects venerated at various times as the Holy Grail, including the Sacro Catino kept in Genoa and, historically, a chalice associated with Antioch now held outside Spain; the cathedral does not claim these traditions are false, only that its own chalice has, in its view, the strongest continuous documented custody trail of any surviving candidate. The Church's position, consistent with its handling of comparable relics elsewhere in this atlas, treats the identification as a matter of venerable tradition rather than one it claims to have proven historically.