Do we have any evidence for who Brigid was in preChristian Ireland?
The links to the four texts are below.

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Cormac's Glossary
https://archive.org/details/sanaschor...

Cath Maige Tuired
https://www.sacredtexts.com/neu/cmt/...

Rennes Dindshenchas
https://archive.org/details/revuecelt...

Lebor Gabála Érenn
https://archive.org/details/leborgabl...