Feast of the Blessed Virgin Mary, Ransom of Captives, established 1696 in
memory of the founding of the Mercedarian order, which Mary requested
through an apparition. See more at:
official website in Spanish
787: In Nicea, start of the
second general council regarding expressions of devotion to images of Christ, Mary, and the saints.
1518: On Haiti, the Mercedarians
establish Cozumel, the first Marian shrine on the island.
Our Lady of Walsingham, had been established by JPII in 2000 (see http://www.walsingham.org.uk/romancatholic/calendar/)