Eucharistic Miracle of Lanciano

In the eighth century, in the town of Lanciano on the Adriatic coast of central Italy, a Basilian monk celebrated Mass at the church of St. Legontian while struggling with doubt about the real presence of Christ in the Eucharist. At the words of consecration, the host transformed into a piece of flesh and the wine into blood, which coagulated into five small clots of unequal shape and size.

The monk’s name is not recorded. The earliest written accounts of the event date to 1574 — an 800-year gap that historians have noted as a fundamental challenge to verification of the original circumstances. The timeframe of the miracle, estimated at 730–750 AD, coincides with the iconoclastic policies of Byzantine Emperor Leo III, which drove many Greek monks including Basilians into Italian exile.

The physical relics have been preserved at the site ever since, passing from Basilian to Benedictine custody in 1176 and relocated to a new altar in 1902. They are currently housed in the Church of St. Francis in Lanciano in a silver and glass reliquary made in Naples in 1713. The flesh is a yellowish-brown rounded membrane with a central hole; the five blood clots are earthy brown and of varying shapes and sizes.

In 1574, Archbishop Gaspare Rodriguez formally examined the relics and recorded a notable observation about the blood clots: each individual clot weighed the same as all five combined — that is, each clot’s weight equaled the total weight of the group, regardless of the order of weighing.

The most significant modern examination was conducted in November 1970 by Dr. Odoardo Linoli, head of the clinical analysis laboratory at the hospital of Arezzo, assisted by Dr. Ruggero Bertelli of the University of Siena, with authorization from Archbishop Pacifico Perantoni. Linoli presented his findings on March 4, 1971. His study found the flesh to be human cardiac tissue — specifically myocardium and endocardium (the muscle and lining of the heart). The blood tested as type AB. No preservatives were detected. Linoli’s report was subsequently published in a peer-reviewed journal (Quaderni Sclavo di Diagnostica, 1971), and the study is indexed on PubMed.

Claims circulated widely that a World Health Organization commission conducted 500 examinations over fifteen months between 1973 and 1976, independently confirming Linoli’s findings and declaring the phenomenon scientifically inexplicable. These claims appear in many Catholic sources. However, cardiologist and researcher Franco Serafini later located the supposed WHO document in a safe at a Lanciano monastery and determined it was fraudulent: pages describing the Lanciano relics had been appended to unrelated documentation about Egyptian mummies. The WHO report should not be cited as independent confirmation.

A subsequent microscopic analysis was conducted by Dr. Bertelli in 1981 using a fragment not consumed in the 1971 examination, which confirmed the tissue findings.

The Catholic Church recognizes the miracle as authentic. Pope John Paul II visited the relics while serving as a cardinal. A 2024 academic critique by Kearse and Ligaj raised methodological concerns about the 1971 study, noting that Linoli himself documented the presence of fungus, spores, and hyphae in the material, and that the blood substance was in a uniformly hardened state.