Christian Saint Mamertus (400-475) was born in Vienne to a wealthy Gallo-Roman family from Lyon. The name was derived from the Roman god of war Mars. He became Bishop of Vienne in 461. Around 464, he quarreled with Pope Hilarius (+468) over a reorganization of the dioceses in southern France. Mamertus himself appointed a new bishop in St. Dié and was sharply criticized for this by the Pope. After numerous fires, earthquakes and major destruction in his hometown in 470, Mamertus introduced the "Three Petitions" before Ascension Day, as well as processions to avert danger and to seek divine help.
Mamertus is one of the five Eisheiligen, his feast day is May 11th (in France also October 13th and November 14th). He is the patron saint of nurses, shepherds and fire brigades; against breast diseases, fever and drought, Two Bauernregeln are: 1) Mamertus, Pankratius . Servatius - stand for cold and annoyance 2) St. Mamerz - has a heart made of ice . See also under Customs in viticulture and wine Saints,