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.

21 December – Saint Thomas the Apostle

Annus Dierum Sanctorum
Posui te in lucem gentium, ut sis in salutem usque ad extremum terrae.
I have set thee to be the light of the Gentiles; that thou mayest be for salvation unto the utmost part of the earth.
Acts 13.47
Homo cordis
Man of the heart
1 Peter 3.4

Modern Hagiography

Bibliotheca Sanctorum

Roman Martyrology

Sanctorale Catholicum

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 

La vie des saints 

La vie des saints

Stories of the Saints Third Series by Mary Seymour.

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.

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

Goffine’s Devout Instructions on the Epistles and Gospels for the Sundays and Holydays

The lives of saints, with other feasts of the year, according to the Roman calendar by Peter Ribadeneira.

Tradition in Action

Biblical and Ancient & Medieval Texts

Biblical verses

Acts of the Holy Apostle Thomas

BHL, Supplement

The Cult of Saints in Late Antiquity Database

The Golden Legend (and illustrations)

Aelfric’s Life

Breviarium Romanum – Latin & English

Art & Architecture

Index of Medieval Art

Catalogo generale dei beni culturali

BeWeB

Portail Biblissima

POP : la plateforme ouverte du patrimoine

The Doubting of Thomas among the mosaics in Sant’Apollinare Nuovo in Ravenna.

An Ottonian ivory in Berlin, in which the Doubting of Thomas is paired with Moses receiving the tablets of the law (a larger image file here).

A relief carving at the Monastery of Santo Domingo in Silos, Spain (an incredible closeup).

Menologion of Basil II (about)

A painting by Caravaggio in Potsdam (background).

Warburg Institute Iconographic Database

Guide to Christian Iconography: Images, Symbols, and Texts

Kornbluth Photography Historical Archive

Medieval Religion Listserv – 2016 Dillon.

Saints and their Attributes
Saints and their Emblems

Sacred and Legendary Art volume I by Mrs. Jameson.

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

A Garner of Saints: Being a Collection of the Legends and Emblems Usually Represented in Art by Allen Hinds.

Lives and Legends of the Evangelists, Apostles, and Other Early 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.

Sacred Symbols in Art by Elizabeth Edwards Goldsmith.

Music

Medieval Music Database

Cantus: A Database for Latin Ecclesiastical Chant

Devotions & Celebrations

Meditations for the Use of the Secular Clergy by Pierre Chaignon.

Manna for the Soul: Meditations for Every Day of the Year by Paulo Segneri.

Meditations for All the Days of the Year by M. Hamon.

The Church Seasons Historically and Poetically Illustrated by Alexander H. Grant.