Poland
Legnica
2013 · Legnica

Spain · 13th Century
In 1297 in Gerona (modern-day Girona), Spain, a priest was celebrating Mass in the church of an ancient monastery of the Benedictines of San Daniele. At some point during the sacred liturgy, doubts began to plague his mind about whether the Holy Eucharist was truly the Body of Christ—a crisis of faith that would be answered in a most extraordinary and personal way.
When the time came for Communion, the priest placed the consecrated Host in his mouth to consume it. To his shock and amazement, he found himself unable to swallow the Blessed Sacrament. The Host had transformed into blood-dripping flesh inside his mouth, which witnesses understood as a visible sign of Christ's Real Presence in the Eucharist. The transformation occurred at the very moment of his doubt, as if Christ Himself was providing the answer the priest's wavering faith required.
Afterward, the priest removed the flesh and placed it in a cloth. A nun later recovered the miraculous flesh for preservation. The priest then publicly confessed to having doubted the True Presence of Christ in the Eucharist, his testimony serving as a powerful witness to others. Tragically, the relic of the Host transformed into flesh was destroyed in 1936 during the Spanish Civil War, though the historical documentation of the miracle remains preserved in Church records and testimonies.
After the Mass, the nuns went immediately to the altar to verify what the priest had hidden in the white cloth and with great amazement discovered that it contained a small piece of Flesh, dripping with Blood. The relic was preserved until its destruction in 1936 during the Spanish Civil War.
This miracle has received explicit recognition from Vatican/papal authority through formal decrees, papal bulls, or official Holy See approval.
The priest publicly confessed to doubting the Real Presence of Jesus in the Eucharist, and his testimony was documented. However, there is no record of a papal bull, a decree of the Congregation for the Doctrine of the Faith, or any other magisterial document in the material provided that specifically mentions the alleged Eucharistic miracle of Gerona (Spain, 1297).
Recognition status cross-referenced using Magisterium AI, a third-party tool that searches a corpus of Catholic Church documents. This does not constitute official Church verification.
Official Real Presence documentation
Carlo Acutis international exhibition entry
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Catholic blog with historical research
Direct Carlo Acutis exhibition page with details