In the city of Poznan, in 1399, three consecrated Hosts were robbed by some desecrators who struck them with some hole-punchers in order to deface it.
The Hosts began to drip blood and every attempt to destroy them proved futile. At that point, the malefactors, in order not to be discovered, decided to cast them into a marsh.
But the particles were suspended in the air and began to radiate strong flashes of light.
Only after fervent prayers did the bishop succeeded in recovering the particles, which can be venerated today at the Church of Corpus Christi in Poznan.
In the city of Poznan, profaners with an intense hatred for the Christian faith persuaded a domestic helper to take three consecrated Hosts from the Dominican (S. Jesus) church.
The woman, enticed by a large reward, succeeded in stealing three Hosts.
Immediately after she received the Hosts, the malefactors went to the basement of their mansion, put them on a table and desecrated them, beating them with a hole-puncher.
Suddenly a copious amount of blood began to drip from the Particles, which splashed the face of a girl in the group afflicted with blindness, and she immediately regained her sight.
The desecrators, seized with panic and anxiety, tried to destroy the Hosts, which nevertheless remained whole.
Unable to rid themselves of them, they decided to take them outside the city and cast them into a marsh in the vicinity of the Watra River.
A young shepherd who happened to be passing near the marsh saw the three luminous Hosts suspended in the air.
Holding back his emotions, he returned home and recounted everything to his father and the local authorities. The burgomaster was indifferent to the young man's account and ordered him to be jailed.
The young shepherd managed to mysteriously escape and again presented himself to the burgomaster, who finally convinced of the facts made his way to the place of the miracle.
In the meantime, the entire population had gathered around the three luminous Hosts suspended in the air.
Only Bishop Wojciech Jastrzębec, after beseeching Heaven with fervent prayers, succeeded in recovering the Particles, which descended into the pyx he held in his hands.
The bishop immediately directed that a solemn procession be formed to accompany the miraculous Hosts to St. Mary Magdalene church.
At the site of the miracle, a wooden chapel was constructed which became the goal for many pilgrimages. King Władysław Jagiello came to know of the miracle and made a gift to Poznan to venerate the miraculous Hosts.
As a sign of devotion, the king ordered that a church dedicated to the Body of Christ (Corpus Domini) be built at the exact spot where the miracle occurred.
In the 19th century, in place of the old mansion where the profanation of the Particles took place, a shrine was constructed where even today the table with the imprints from the Blood that dripped from the Hosts has been preserved.
Every Thursday a procession with the Blessed Sacrament takes place at Corpus Domini church to recall the miracle.