During the celebration of the Mass, a priest saw numerous drops of Blood fall from the consecrated Host. The miracle contributed to strengthening the belief of the priest and many of the faithful, among whom was also the King of Castile. There are numerous documents that testify to the miracle.
The relics of the marvel had been exhibited to the veneration of the faithful during the Eucharistic Congress of Toledo in 1926 and even today are the objects of deep devotion to the whole of the Spanish people.
Even today, in the sanctuary of Guadalupe, it is possible to admire the precious relics of the Corporal and of the bloodied pall (the pall is the small rigid linen cloth, of square shape, that serves to cover the chalice and the paten), used during the miraculous Mass from the Venerable Don Pedro Cabañuelas, in the region of Toledo.
He was always distinguished for his deep devotion to the Holy Eucharist, and he spent many hours in adoration both night and day before the Blessed Sacrament. He had been brutally tempted to doubt about the reality of transubstantiation, but in 1420 all of his doubts had disappeared.
As he had been accused to do daily, Don Pedro began to celebrate the Holy Mass: at the moment of the consecration he saw a dense cloud to come down from above and settle itself above the altar. He could not see anymore.
Then the priest began to implore the Lord to cancel his doubts.
Slowly the cloud began to reduce itself and presented this sight: the Host was lifted above the chalice and abundant drops of Blood began to fall that immediately replenished the chalice and even overflowed pouring onto the corporal and on the pall.
At that point, the priest heard a voice that said: "End the Holy Mass, and for the moment reveal to no one what you saw".
The miracle later on was published by the brothers of Don Pedro and the news spread in all of Spain until it arrived at the King of Castile, Don Juan II and to the Queen, Lady Maria of Aragon, who became so devoted to the miracle, that they asked to be buried near the body of the Venerable Father Pedro Cabañuelas.