11 May – Saint Mamertus

Modern Hagiography

Roman Martyrology

Sanctorale Catholicum

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

Character Calendar 

Pictorial Lives of the Saints 

Our Birthday Bouquet Culled from the Shrines of the Saints and the Gardens of the Poets by Eleanor C. Donnelly.

Pictorial Half Hours with the Saints by Auguste François Lecanu.

Medieval Hagiography

BHL, Supplement

Letter from Sidonius Apollinaris about Bishop Mamertus instituting Rogation Days (scroll down to letter XIV)

The Golden Legend (and illustrations)

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