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Saint Parthenius
Roman Christian martyr and saint
SaintFull write-upPre-congregation
Feast: 19 May (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Born
—
unknown
Died
250
Beatified
—
not needed: before formal processes
Canonised
By tradition
recognised before formal processes began
Who they were
Also at Rome, Saints Parthenius and Calocerus, martyrs, who under the emperor Diocletian bore outstanding witness to Christ.
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 19 May as a martyr at Rome under Diocletian, with Saint Calocerus.
Sources
- Roman Martyrology, 19 May (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q7401982 — dates, feast day and identifiers (CC0)
- English Wikipedia — Saint Parthenius (CC BY-SA)
Checked against the sources listed on 22 September 2026. Corrections welcome.