12 April – Saint Julius I

Modern Hagiography

Bibliotheca Sanctorum

Martyrologium Romanum

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 

La vie des saints

Tradition in Action

Medieval Hagiography

BHL

Acta Sanctorum

The Cult of Saints in Late Antiquity Database

Liber pontificalis

Writings of Pope Julius

Documenta Catholica Omnia

His correspondence (not in the public domain)

Art & Architecture

Index of Medieval Art

Portail Biblissima

Panel showing consecration of Saint Donatus, lower register, second from left) – Betto di Francesco – Giovanni di Francesco (1364-1375), Arca di San Donato, about

Saints and their Emblems

12 April – Saint Zeno of Verona

Fra Filippo Lippi and workshop
Saint Zeno exorcising the Daughter of Gallienus
1455-60

Modern Hagiography

Bibliotheca Sanctorum

Martyrologium Romanum

Roman Martyrology

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

Rome and the Negro:  Lives of the Noted African Bishops, Saints, Martyrs, Holy Women and Fathers of Deserts

Medieval Hagiography

BHL, Supplement

Acta Sanctorum

The Cult of Saints in Late Antiquity Database

Writings by Saint Zeno

Documenta Catholica Omnia

Art & Architecture

Index of Medieval Art

Catalogo generale dei beni culturali

BeWeB

Medieval Religion Listserv – 2016 Dillon.

The Church of San Zeno in Veronathe bronze doors & the Altarpiece in the church

15C Polyptych

Pistoia Santa Trinità Altarpiece – Saints Zeno and Jerome & Saint Zeno exorcising the Daughter of Gallienus (above)

Saint Zeno, Saint John the Baptist and a Female Martyr

Post-Biblical Saints Art Index
Saints and their Attributes
Saints and their Emblems

Caractéristiques des saints dans l’art populaire by Charles Cahier – démon, poisson, possédé.

Sacred and Legendary Art volume II by Mrs. Jameson.

A Handbook of Christian Symbols and Stories of the Saints as Illustrated in Art by Clara Erskine Clement.

Lives and Legends of the Great Hermits and Fathers of the Church, with Other Contemporary Saints by Mrs. Arthur Bell.

The Saints in Art with Their Attributes and Symbols, Alphabetically Arranged by Margaret E. Tabor.

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

The Saints in Art by Joseph Maria von Radowitz.

Emblems of Saints by Which They Are Distinguished in Works of Art by F. C. Husenbeth.