16 August – Saint Hyacinth

Modern Hagiography

Bibliotheca Sanctorum

Martyrologium Romanum

Roman Martyrology

Lives of the Saints by Alban Butler.

Lives of the Saints by Francis Weninger.

Lives of the Saints by Sabine Baring-Gould.

The Liturgical Year by Dom Guéranger.

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.

Miniature Lives Of The Saints For Every Day In The Year by Henry Sebastian Bowden.

Short Lives of the Dominican Saints 

Stories of the Saints Fifth Series by Mary Seymour.

The Lives of Saints, with Other Feasts of the Year, According to the Roman Calendar by Peter Ribadeneira.

La vie des saints

Medieval Hagiography

BHL 

Acta Sanctorum

Breviarium RomanumLatin & English.

Art & Architecture

Vatican Colonnade 

Warburg Institute Iconographic Database 

Guide to Christian Iconography: Images, Symbols, and Texts

Google Arts & Culture 

Post-Biblical Saints Art Index
Saints and their Attributes

Legends of the Monastic Orders as Represented in the Fine Arts 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 English Bishops and Kings, Mediaeval Monks, and Other Later 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.