He was the Bishop of Vienne in France. In order to avert some impending calamities he introduced the custom of penitential processions, later adopted by the entire Catholic Church as the three Rogation Days preceding Ascension Thursday.
Saint Mamertus (477)
Brother André Marie, M.I.C.M.What’s in That Prayer? The Collect for Pentecost Sunday https://t.co/CrfqCvwn7g9 hours ago 2 9
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Brother André Marie, M.I.C.M.Did you know that St Bernard dogs are named after today’s Saint? https://t.co/AZoExNHV1a9 hours ago 4 23