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Theonestus of Vercelli
Italian saint
SaintFull write-upDate unknown
Feast: 20 November (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Born
—
unknown
Died
—
unknown
Beatified
—
not on record
Canonised
—
not on record
Who they were
At Vercelli, Saint Theonestus, martyr, in whose honour the bishop Saint Eusebius built a basilica.
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 20 November as a martyr of Vercelli in whose honour Saint Eusebius built a basilica.
Connected on this site
- Eusebius of Vercelli Saint“Theonestus may have been a member of the early Christian community in Vercelli, living in an era earlier than that of Eusebius of Vercelli.” — Wikipedia
Sources
- Roman Martyrology, 20 November (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q7782256 — dates, feast day and identifiers (CC0)
- English Wikipedia — Theonestus of Vercelli (CC BY-SA)
Checked against the sources listed on 22 September 2026. Corrections welcome.