31 May – Saint Petronilla

Modern Hagiography

Bibliotheca Sanctorum

Martyrologium Romanum

Roman Martyrology

Sanctorale Catholicum

Dictionary of Saintly Women

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

The Liturgical Year by Dom Guéranger.

Pictorial Lives of the Saints 

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.

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

Cantus: A Database for Latin Ecclesiastical Chant

The Golden Legend (and illustrations)

Art & Architecture

Index of Medieval Art

Catalogo generale dei beni culturali

BeWeB

Europeana

Portail Biblissima

POP : la plateforme ouverte du patrimoine

Warburg Institute Iconographic Database

Medieval Religion Listserv – 2016 Dillon.

Altar of Santa Petronilla in San Pietro in Vaticano

Santa Domitilla

Santa Maria della Febbre

Post-Biblical Saints Art Index
Saints and their Attributes
Saints and their Emblems

Caractéristiques des saints dans l’art populaire by Charles Cahier – balai, Communion.

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.

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.

Music

Cantus: A Database for Latin Ecclesiastical Chant

31 May – Saint Angela Merici

Moretto da Brescia, Funerary Portrait of Angela Merici, Centro Mericiano, Brescia, “Image as Relic: Moretto’s Funerary “Portrait” of
Angela Merici”

Modern Hagiography

Bibliotheca Sanctorum

Martyrologium Romanum (27 January)

Roman Martyrology – 27 January & 31 May

Dictionary of Saintly Women

Lives of the Saints by Sabine Baring-Gould.

The Liturgical Year by Dom Guéranger.

Character Calendar 

La vie des saints 

Miniature Lives of the Saints for Every Day in the Year

Longer form biography by Irene Mahoney.  See also her Portraits of Angela.

Breviarium Romanum – Latin & English.

Writings of the Saint

Regula, Ricordi, Legati (in Italian).

Art & Architecture

BeWeB

Europeana

Vatican Founder Statue

Post-Biblical Saints Art Index

198 – Watermarked Photograph of Painting

Saints and their Emblems

Caractéristiques des saints dans l’art populaire by Charles Cahier – apparition de SS., echelle, groupe, manteau.

The Saints in Art by Joseph Maria von Radowitz.

Customs & Devotions

Prayer to Saint Angela Merici

31 May 1725 – Eucharistic Miracle in Marseilles

Legends of the Blessed Sacrament Gathered from the History of the Church and the Lives of the Saints by Emily Mary Shapcote.

Basilique du Sacré-Cœur de Marseille – Wikipedia, Wikimedia Commons

See also 4 June – Henri-François-Xavier de Belsunce de Castelmoron