caption death_date death_place feast_day imagesize venerated_in image article_title name
an , '' little pictorial lives of the saints '' engraving of saint mamertus from an 1878 book c. ad 475 arles , present-day france may 11 275px roman catholic church eastern orthodox church mammertus.jpg mamertus
 saint mamertus
mamertus

saint mamertus -lrb- died c. 475 -rrb- was the bishop of vienne in gaul and is a saint in the roman catholic church .
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 .
