[1] To Illidius is attributed the rise of Clermont-Ferrand as a center of religious teaching and culture.

[2] Gregory of Tours mentions Illidius in his work.

Illidius is credited with having cured the daughter of the Roman Emperor Magnus Maximus at Trier,[3] and died on the return journey.

The fountain of St. Allyre at Clermont is known for its petrifying water, caused by calcareous deposits.

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