The greatest mystery of the Duomo of Berceto, also known as the Duomo of San Moderanno, concerns an ancient and precious glass chalice. It is one of the discoveries of the Cathedral of mysterious origins, recovered inside the tomb of the French monk, Bishop of Rennes, Moderanno buried inside the parish church of Berceto.
During his journey to the capital of Christianity, he stopped in the small village of the Parma Apennines and decided to stay there.
Several scholars have supported the hypothesis that the glass chalice is nothing less than the Holy Grail, the cup used by Jesus Christ during the Last Supper and with which he was later collected his blood during the crucifixion, and the most important relic of the entire Christian world, what, according to legend, the Templars had long sought.