9 June – Saint Primus and Saint Felicianus

Santo Stefano Rotondo
Saint Prime et Félicien devant le juge (France, Paris. Bibliothèque nationale de France, Département des manuscrits, Français 51 f.66)

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.

The Liturgical Year by Dom Guéranger.

Character Calendar 

Pictorial Lives of the Saints 

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, Supplement

Acta Sanctorum

The Cult of Saints in Late Antiquity Database

The Golden Legend (and illustration)

Breviarium RomanumLatin & English.

Art & Architecture

Index of Medieval Art

Portail Biblissima

POP : la plateforme ouverte du patrimoine

Europeana

BeWeB

Warburg Institute Iconographic Database 

The Chapel of Saints Primus and Felicianus in the church of Santo Stefano Rotondo in Rome (gallery of photos of the church, including the mosaics in the chapel, photo of the apse mosaic, paintings of cycle of martyrdoms by Antonio Tempesta)

Post-Biblical Saints Art Index
Saints and their Attributes

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

Music

Cantus: A Database for Latin Ecclesiastical Chant