Saint Maria Faustina Kowalska was a 20th-century Polish nun and mystic, known by the Roman Catholic church as the "apostle of Divine Mercy". She experienced miraculous visions of Jesus Christ, which she recorded in her diary. In these visions, the Divine Mercy of Jesus was emphasized, and in particular, Jesus requested that the first Sunday after Easter would be a commemoration of his Divine Mercy. Under the Papacy of Pope John Paul II, this change took place in the Roman Catholic liturgical calendar.