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Eustorgius I
Archbishop of Milan, Saint
SaintFull write-upPre-congregation
Feast: 18 September (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Born
250
Died
350
Beatified
—
not needed: before formal processes
Canonised
By tradition
recognised before formal processes began
Who they were
At Milan, Saint Eustorgius, bishop, whose profession of the true faith against the Arian heresy Saint Athanasius praises.
The miracles
There was never a formal cause: he has been honoured as a saint since before the Church's formal processes began.
Why that counted as sanctity
The Roman Martyrology remembers him on 18 September as a bishop of Milan praised by Saint Athanasius for his faith against Arianism.
Sources
- Roman Martyrology, 18 September (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q2571165 — dates, feast day and identifiers (CC0)
- English Wikipedia — Eustorgius I (CC BY-SA)
Checked against the sources listed on 22 September 2026. Corrections welcome.