22 April – Saint Opportuna

Modern Hagiography

Dictionary of Saintly Women

Book of Saints by Alban Butler.

Medieval Hagiography

BHL

Acta Sanctorum

La vie de sainte Opportune, abbesse d’Almenêches au diocèse de Séez en Normandie, poème legendaire du moyen-âge, publié pour la première fois avec une introduction et des notes

Art & Architecture

Index of Medieval Art

POP : la plateforme ouverte du patrimoine
including Sainte Opportune, saint Julien de Brioude

Saints and their Attributes

Lives and Legends of the English Bishops and Kings, Mediaeval Monks, and Other Later Saints by Mrs. Arthur Bell.

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

Customs & Devotions

Late Medieval French Prayers