During Mass at Ludbreg in1411, 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 theso-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 in his heart the truth of transubstantiation and so 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 secrecy.
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.
Many people testified that they had received marvelous cures while praying in the relic's presence.
On April 14, 1513, Pope Leo X published a Bull permitting veneration of the holy relic which he himself had carried in procession several times through the streets of Rome.
The relic was later returned to Croatia.
**In the 15th century,** northern Croatia was ravaged by the plague. The people turned to God to call upon his help, and the Croatian Parliament did the same.
During the session held on December 15, 1739 in the city of Varazdin, they vowed to build a chapel at Ludbreg in honor of the miracle, if the plague ended.
The plague was averted, but the promise was only fulfilled in 1994, when democracy was restored in Croatia.
In 2005 in the votive chapel, the artist Marijan Jakubin painted a large fresco of the Last Supper in which Croatian saints and blessed were drawn in place of the Apostles.
St.
John was replaced with Blessed Ivan Merz, who was included among the 18 most important Eucharistic saints in the Church's history during the Synod of Bishops on the Eucharist held in Rome in 2005.
In the painting, Christ is holding in his hand a monstrance containing the relic of the Eucharistic miracle.
Since 1721, the relic of the Precious Blood has been kept in a precious monstrance of the Augsburg goldsmith school commissioned by Eleonora Batthyany-Strattman, who gave it as a gift to the church in Ludbreg.
In 1753, the Batthyany family had Mikael Poick decorate the castle chapel where the miracle took place with frescoes depicting the stages of the miracle.
The chapel of the Batthyany family castle where the miracle occurred