22 April – Saint Leonides of Alexandria

Saint Léonide emprisonné (France, Paris. Bibliothèque nationale de France, Département des manuscrits, Latin 4915 f.211v)
The Book of Saints

Modern Hagiography

Bibliotheca Sanctorum

Martyrologium Romanum

Roman Martyrology

Sanctorale Catholicum

Lives of the Saints by Alban Butler.

Pictorial Lives of the Saints 

Medieval Hagiography

Acta Sanctorum

The Cult of Saints in Late Antiquity Database

Eusebius’s Ecclesiastical History

Art & Architecture

Portail Biblissima

Saints and their Emblems

22 April – Our Lady of Betharram

Altare in stucco con la raffigurazione di un miracolo attribuito alla Vergine di Bétharram. Santuario Notre-Dame di Bétharram, Francia
Statua della Vergine di Bétharram nella chiesa di Santa Maria dei Miracoli, a Roma

Modern Mariology

Legends of the Blessed Virgin by Jacques-Albin-Simon Collin de Plancy.

Art & Architecture

POP : la plateforme ouverte du patrimoine

Sanctuaire de Notre-Dame de Bétharram, official website

21 April – Saint Beuno

Restoring Saint Winifred of Wales to Life
Ecclesiæ anglicanæ trophæa
Legends of Saints and Birds
The Book of Saints

Modern Hagiography

Bibliotheca Sanctorum

Sanctorale Catholicum

A Menology of England and Wales

Lives of the British Saints by Sabine Baring-Gould.

Legends of Saints and Birds by Agnes Aubrey Hilton.

Art & Architecture

Index of Medieval Art

St Beuno’s Church, Clynnog Fawr, Wikimedia Commons, Slab from Shrine

Saints and their Attributes
Saints and their Emblems