8 January – Saint Erhard of Regensburg

Modern Hagiography

Lives of the Saints by Alban Butler.

Medieval Hagiography

BHL, Supplement

Sancta Sanctorum

Art & Architecture

St. Erhard in the Uta Codex

Post-Biblical Saints Art Index

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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