During Mass at Ludbreg in 1411, a priest doubted whether the Body and Blood of Christ were really present in the Eucharistic species. Immediately after being consecrated, the wine turned into Blood. Today the precious relic of the miraculous Blood still draws thousands of the faithful, and every year at the beginning of September the so-called “Sveta Nedilja – Holy Sunday” is celebrated for an entire week in honor of the Eucharistic miracle that occurred in 1411.
In 1411 at Ludbreg, in the chapel of the Count Batthyany’s castle, a priest was celebrating Mass. During the consecration of the wine, the priest doubted the truth of transubstantiation,and the wine in the chalice turned into Blood. Not knowing what to do, the priest embedded this relic in the wall behind the main altar. The workman who did the job was sworn to silence. The priest also kept it secret and revealed it only at the time of his death.
After the priest’s revelation, news quickly spread and people started coming on pilgrimage to Ludbreg. The Holy See later had the relic of the miracle brought to Rome, where it remained for several years. The people of Ludbreg and the surrounding area, however, continued to make pilgrimages to the castle chapel. In the early 1500s, during the pontificate of Pope Julius II, a commission was convened in Ludbreg to investigate the facts connected with the Eucharistic miracle.