Mamertinus of Auxerre

Saint Mamertinus of Auxerre (Mamert) was a monk and abbot who died around 462. He was converted by Saint Germanus of Auxerre and became a monk at the monastery of Saints Cosmas and Damian in Auxerre, of which he later became abbot; the monastery was afterwards rededicated to Saint Marianus. He is a saint of the undivided Church, commemorated on 30 March (new style; 12 April in the old style).