As stated in the old books of Poznań, it all happened in 1399. Several Jews from Poznań bribed a woman to steal the Hosts from the Dominican Church for them. The woman fulfilled her task, and the Jews took their loot to the basement of a nearby house, where they started their peculiar "test".

The blood spurted from the pricked Hosts, which frightened the perpetrators so much that they decided to throw the desecrated Hosts to the sump. But each time the Hosts surfaced and floated in the air above the water. So the Jews came up with the idea to bury the Hosts in the meadows near Poznań. On the other day a shepherd grazing his cattle noticed three white circles floating above the ground, glowing with supernatural light. He told his father about that, and the father reported the strange phenomenon in the town hall. The town councillors did not believe the peasant's story and they locked him up in jail.

But when the prison bars opened and the peasant stood before the council again, they believed him and decided to investigate the matter thoroughly. A priest came to the place of the event, carrying a paten on which the Hosts fell and they were taken to the parish church. However, each time they returned to the meadows in an inexplicable way. Faced with such an obvious sign, they decided to build in the place of the event a Corpus Christi Church, which has been located there until today.