In Roman Catholicism, the Marian apparition at Knock, Ireland, on August 21, 1879, is significant because it had the greatest number of witnesses, with at least 15 people claiming to have seen Mary, alongside other holy figures. The Coptic Orthodox Church recognizes a mass apparition in Cairo during which Mary is said to have appeared many times on the roof of a church in the city’s Zeitoun district between 1968 and 1971, drawing crowds of thousands of people.