On the day of Easter in 1254 in the Church of St. Amato in Douai, a priest who was distributing Holy Communion unintentionally dropped a consecrated Host to the ground. Immediately he bent down to pick up the Sacred Species, but the Host lifted up in flight and lighted on the purificator. A little later, a wonderful Child appeared there Who all the faithful and religious present in the celebration could contemplate.
The news spread quickly, and the Bishop of Cambrai, Thomas de Cantimpré, came immediately to Douai to verify the facts in person, which he described in this manner: “I went to the Dean of the Church, followed by many faithful, and I asked to see the miracle. The Dean opened the small case in which he had reposed the Host of the miracle, but initially I didn't see anything special. “I was conscious though, that nothing could prevent me from seeing, as was true of the others, the Sacred Body. I didn’t even have time to ask myself this type of question, when I scarcely looked at the Host and saw the face of Christ crowned with thorns with two drops of Blood that descended on His forehead. Immediately I knelt, and crying, I began to thank God”.
It is certain that already by the year 1356, that is, one century after the apparition, every year on Wednesday of Holy Week, a feast in memory of the miracle of the Blessed Sacrament was celebrated, and the document which records it indicates that this event was in existence already for a long time.