9 April – Saint Waltrude

Annus Dierum Sanctorum
Nolite conformari huic seculo.
Be not conformed to this world,
Romans 12.2

Modern Hagiography

Roman Martyrology

Dictionary of Saintly Women

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

Medieval Hagiography

BHL, Supplement

Acta Sanctorum

Art & Architecture

Index of Medieval Art

Portail Biblissima
Sainte Wautrude et sainte Gertrude (France, Paris. Bibliothèque nationale de France, Département des manuscrits, NAF 16251 f.104)

BALaT

Europeana, also

Wikimedia Commons

Warburg Institute Iconographic Database

Medieval Religion Listserv – 2016 Dillon.

Shrine of Saint Waltrude

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

Devotions

Ducasse du Mons (see also; not on the feast day of Saint Waltrude)