4 January – Saint Gregory of Langres

Modern Hagiography

Roman Martyrology

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

Pictorial Lives of the Saints 

Contemporary Hagiography

BHL, Supplement

Sancta Sanctorum

Mention in Gregory of Tours’ History of the Franks, Book 3.15 and Book 3.19.

His life is in Gregory of Tours’ Lives of the Fathers (may be borrowed for free, with registration).

An epitaph for Saint Gregory of Langres written by Venantius Fortunatus (only available open access in Latin, but it is not long).

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