As Pope Pope Leo XIV prepares for his visit to Valencia, one of Spain’s greatest religious mysteries is once again back in the spotlight: the search for the true Holy Grail.

And surprisingly, Spain has not one… but two famous chalices, both believed by some historians and believers to be the authentic cup used by Jesus during the Last Supper.

The best known contender is kept inside Valencia Cathedral. Known as the Holy Chalice of Valencia, this small dark red agate cup has a story worthy of a Hollywood movie.

Tradition says Saint Peter took it from Jerusalem to Rome, where early Christians protected it during periods of persecution.

Later, during the Muslim invasion of the Iberian Peninsula in the 8th century, the relic was secretly moved across northern Spain, hidden in monasteries deep in the Pyrenees before eventually arriving in Valencia in the 1400s.

What makes this grail especially fascinating is that several Popes, including Saint John Paul II and Benedict XVI, have actually used it during Mass.

While the Vatican has never officially confirmed it as the authentic Holy Grail, historians agree that parts of the cup date back to the time of Christ.

But Valencia is not alone. In the city of León, inside the ancient Basílica de San Isidoro, another chalice challenges Valencia 's claim.

Known as the Chalice of Doña Urraca, researchers created worldwide headlines after suggesting it may also have travelled from Jerusalem through Egypt before reaching medieval Spain through royal alliances and Christian kingdoms.

Faith, history, politics, and legend all collide in these mysterious cups. Whether authentic or not, Spain has become one of the world’s most unexpected guardians of one of Christianity’s greatest legends.

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