18 April – Saint Galdinus of Milan

oratorio/chiesetta di San Galdino
The Book of Saints

Modern Hagiography

Bibliotheca Sanctorum

Martyrologium Romanum

Roman Martyrology

Lives of the Saints by Sabine Baring-Gould.

Tradition in Action

Medieval Hagiography

BHL, Supplementum

Acta Sanctorum

Art & Architecture

Catalogo generale dei beni culturali

BeWeB

Medieval Religion Listserv

Wikimedia Commons (tomb in the Duomo of Milan)

Saints and their Emblems

Caractéristiques des saints dans l’art populaire by Charles Cahier – edifices.