Nihil sub sole novum

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.

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

Pope Damasus’s Epitaph

“Nereus and Achilleus the martyrs joined the army and carried out the cruel orders of the tyrant, obeying his will continually out of fear. Then came a miracle of faith. They suddenly gave up their savagery, they were converted, they fled the camp of their evil leader, throwing away their shields, armor, and bloody spears. Professing the faith of Christ, they are happy to witness to its triumph. From these words of Damasus understand what great deeds can be brought about by Christ’s glory.” (quoted many places, searching for the source)

The Golden Legend (and illustrations)

Breviarium Romanum – Latin & English.

Art & Architecture

Index of Medieval Art – Saint Nereus & Saint Achilleus

Catalogo generale dei beni culturali

BeWeB

Portail Biblissima

POP : la plateforme ouverte du patrimoine

Warburg Institute Iconographic Database

Vatican Colonnade – Nereus & Achilleus

The church of Santi Nereo e Achilleo in Rome

Rubens, Saint Domitilla with Saints Nereus and Achilleus

Caractéristiques des saints dans l’art populaire by Charles Cahier – epée.

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.

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.