In 1429, in Alkmaar's Cathedral of Saint Lawrence, a priest named Folkert was celebrating his first Mass.
After the consecration, the priest accidentally knocked over the chalice, spilling consecrated wine on the altar and on his chasuble. The wine was miraculously transformed into Blood.
Every attempt to remove the traces of Blood from the chasuble was in vain.
The precious reliquary of the chasuble soaked in Blood is preserved even today in the Cathedral of Saint Lawrence in Alkmaar.
In the Cathedral of Saint Lawrence in Alkmaar there is a precious reliquary shaped like an angel that contains the chasuble soaked in Blood from the Eucharistic miracle that happened in 1429.
On May 1, 1429, a priest named Folkert was celebrating his first Mass in the Cathedral of Saint Lawrence. The pastor, Father Volpert Schult, assisted.
Shortly after having pronounced the words of consecration, Father Folkert inadvertently knocked over the chalice containing the consecrated wine, and in its place appeared living Blood.
After Mass, in a state of panic, he cut off the part of the chasuble that was spotted with Blood and burnt it. He then took the remaining piece and began sewing it up.
But as soon as he finished mending the chasuble, the Blood spots reappeared. The two priests, not knowing what to do, immediately took the chasuble to the Bishop of Utrecht.
In 1433, after numerous canonical investigations, the bishop officially approved devotion surrounding the miracle.