Mamertus [SEP] canonization status
Mamertus
Saint Mamertus (died c. 475) was the bishop of Vienne in Gaul, venerated as a saint. His primary contribution to ecclesiastical practice was the introduction of litanies prior to Ascension Day as an intercession against earthquakes and other disasters, leading to "Rogation Days." His feast day is the first of the Ice Saints.
Life.
Prior to his elevation to the see of Vienne, little has been recorded about Mamertus' life. The fact that his brother, Claudianus Mamertus, the theological writer,
four suffragan dioceses, still subject to Vienne. The bishop invalidly installed by Mamertus was to be confirmed in his office by Leontius, after which he might retain the bishopric. Mamertus evidently submitted, since we find no subsequent reference to the incident. 
During his episcopate, the remains of St. Ferreolus were discovered, and were translated by Mamertus to a church in Vienne, built in honour of that martyr. St. Mamertus was the founder of the Rogation Processions, according to Sidonius Apollinaris, and his second successor, Avitus In