The Corpus Christi miracle is historically linked to Orvieto Cathedral but it occurred 750 years ago in a small town not so far from Orvieto, Bolsena. It was here that a priest coming from far away, Bohemia, was faced by an extraordinary event: during a liturgy, one of his hosts started to bleed. He was scared and kept this secret until he could meet the Pope to obtain the approval of the miracle. He was a good and pious priest but he had doubts about the Real Presence of Christ in the Eucharist.
The Pope sent delegates to investigate the matter. Tradition tells us that this miracle prompted the Pope to commission St.Thomas Aquinas to compose the Liturgy for honouring the Holy Eucharist as the Body of Christ. After all of the facts were gathered, Pope Urban IV ordered the bishop to bring the Host and the blood stained altar cloth to Orvieto. The Cathedral of Orvieto, one of the architectural masterpieced of the Middle Ages was built in honour of the Corpus Christi miracle.