21 May – Saint Constantine

Annus Dierum Sanctorum
Equum, et ascensorum eius deiecit.
the horse and his rider he hath thrown .
Exodus 15.1
Hic magnus, vocabitur.
He shall be called great.
Matthew 5.19

Modern Hagiography

Sanctorale Catholicum

Lives of the Saints by Sabine Baring-Gould.

True Historical Stories for Catholic Children

Short Instructive Sketches from the Lives of the Saints

Medieval Hagiography

BHL, Supplement

Acta Sanctorum

The Cult of Saints in Late Antiquity Database

Life of Constantine & Oration in Praise of Constantine by Eusebius

Writings of Saint Constantine

Oration of Constantine

Art & Architecture

Index of Medieval Art

Catalogo generale dei beni culturali

BeWeB

Portail Biblissima

Warburg Institute Iconographic Database

Kornbluth Photography Historical Archive

Santi Quattro Coronati in Rome – informationphotos, scroll down past photographs from San Clemente to see the photographs from the chapel of Saint Sylvester – video

Frescoes in the Bardi di Vernio Chapel, Santa Croce, Florence

Storie della Vera Croce in San Francesco in Arezzo

Sala di Constantino in the Vatican

Galleria Franchetti, Ca’ d’Oro, Venice – Finding of the True Cross, Trial of the True Cross, Vision of Constantine, Victory of Constantine

The Vision of Constantine by Bernini, Vatican website

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.

The Saints in Art by Joseph Maria von Radowitz.

See also 31 December – Saint Sylvester.