What to do when your diocese is overwhelmed by hostile invaders and natural disasters? Around 470 Saint Mamertus, Bishop of Vienne in Dauphiny (today’s France), had to figure out a plan of action. The Goths, the Huns, earthquakes, fires and crop failures were plaguing the faithful of his diocese. What to do? How about turning to God? He initiated “rogation” or “asking” processions – several days of penitential processions with public supplications. The devotion soon spread far beyond Vienne. In 816 Pope Leo III introduced this practice into Rome and eventually it was observed throughout the Church. There were processions during which the Litany of the Saints, Psalms and other prayers were chanted, followed by a special Rogation Day Mass on the Monday, Tuesday and Wednesday before Ascension Thursday.