22 December – Saint Ischyrion

Modern Hagiography

Bibliotheca Sanctorum

Martyrologium Romanum

Roman Martyrology – 22 December & June 1

The Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

Character Calendar 

Pictorial Lives of the Saints

Ancient Hagiography

The Cult of Saints in Late Antiquity Database

Letter of Saint Dionysius of Alexandria to Fabius Bishop of Antioch (scroll down to Epistle 3)

Art & Architecture

Saints and their Attributes
Saints and their Emblems

21 December – Saint Themistocles

Modern Hagiography

Bibliotheca Sanctorum

Martyrologium Romanum

Roman Martyrology

Sanctorale Catholicum

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

The Cult of Saints in Late Antiquity Database

Art & Architecture

Index of Medieval Art

Saints and their Attributes
Saints and their Emblems

Saints and their Symbols: A Companion in the Churches and Picture Galleries of Europe by E. A. Greene.

Sacred Symbols in Art by Elizabeth Edwards Goldsmith.