On Thursday the twenty-first of August, 1879, at around seven in the evening, fifteen people in a village in western Ireland saw three figures and an altar appear on the gable wall of their parish church. The figures did not move. The figures did not speak. They stood silently in the pouring rain for two hours.

The village was Knock, in County Mayo. The first witness was a forty-five-year-old housekeeper named Mary McLoughlin, walking home along the lane that ran past the south wall of the church. She saw a tall white figure flanked by two others. She thought the priest had ordered new statues. She walked on. Twenty minutes later she returned with a friend, twenty-nine-year-old Mary Byrne. Byrne saw what McLoughlin saw. They began running through the village calling people out of their cottages.

Within an hour fifteen villagers were standing in the rain in the field beside the church. In the centre stood the Virgin Mary in white, with a crown of roses on her head, her hands raised in prayer. To her right stood Saint Joseph. To her left stood Saint John the Evangelist, dressed in a bishop's mitre, holding an open book and apparently preaching, though no sound came. Beyond John stood an altar. On the altar stood a Lamb. Behind the Lamb stood a plain wooden cross. Above the altar, angels hovered with beating wings. The figures were silent. The figures did not move. The rain fell through them onto the gable wall.

The witnesses ranged in age from a five-year-old boy named John Curry to a seventy-four-year-old woman named Bridget Trench. There were six children and nine adults, men and women, farmers, schoolchildren, tradesmen, all from the same village. They watched in the pouring rain for nearly two hours. They prayed the rosary aloud together. Then the figures faded. The wall was empty.

On the eighth of October the Archbishop of Tuam established a Commission of Enquiry. The commission cross-examined each witness separately. The depositions matched. The commission found their testimony trustworthy and satisfactory. A second commission in 1936 re-examined the surviving witnesses and reached the same verdict.

On the thirtieth of September, 1979, Pope John Paul the Second flew to Knock for the centenary. He was the first reigning Pope to visit Ireland. He raised the parish church to a Minor Basilica. The gable wall is still there. The depositions are still on file.

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