25 May – Saint Urban I

Modern Hagiography

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.

Medieval Hagiography

BHL, Supplement

Liber pontificalis 

The Golden Legend (and illustrations)

Art & Architecture

16C Fresco of Saint Valerian and Pope Urban

Warburg Institute Iconographic Database

Post-Biblical Saints Art Index

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

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.

See also 22 November – Saint Cecilia (when it appears).

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