The nine pieces of bone sat nestled like rings in a jewel box inside a bronze display case on the side of the altar during a Mass commemorating the end of the Vatican's yearlong celebration of the Christian faith. It was the first time they had ever been exhibited in public.
Pope Francis prayed before the fragments at the start of Sunday's service and then clutched the case in his arms for several minutes after his homily.
But last week, a top Vatican official, Archbishop Rino Fisichella, said it almost doesn't matter if archaeologists one day definitively determine that the bones aren't Peter's, saying Christians have prayed at Peter's tomb for two millennia and will continue to, regardless.
"It's not as if pilgrims who go to the altar (of Peter's tomb) think that in that moment in which they profess their faith that below them are the relics of Peter, or of another or another still," he told reporters. "They go there to profess the faith."
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During the excavations, archaeologists discovered a funerary monument with a casket built in honor of Peter and an engraving in Greek that read "Petros eni," or "Peter is here."
The scholar of Greek antiquities, Margherita Guarducci, who had deciphered the engraving continued to investigate and learned that one of the basilica workers had been given the remains found inside the casket and stored them in a shoe box kept in a cupboard.
Top Vatican Jesuits and other archaeologists strongly denied the claim, but had little recourse.