17 March – Saint Gertrude of Nivelles

Modern Hagiography

Roman Martyrology

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

Medieval Hagiography

BHL, Supplement

Two nearly contemporary texts about Saint Gertrude (neither of which is available in the public domain)

Art & Architecture

16C Triptych with Saint Gertrude

Warburg Institute Iconographic Database

Guide to Christian Iconography: Images, Symbols, and Texts

Post-Biblical Saints Art Index

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.

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