In a series of 14 revelations to St. Maria Faustina Kowalska in the 1930s, our Lord called for a special feast day to be celebrated on the Sunday after Easter.  Today, we know that feast as Divine Mercy Sunday, named by Pope St. John Paul II at the canonization of St. Faustina on April 30, 2000. The Second Sunday of Easter was already a solemnity as the Octave Day of Easter. The title "Divine Mercy Sunday" does, however, highlight the meaning of the day.