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Sisinnius of Cyzicus
bishop and martyr at Cyzicus
SaintResearchedDate unknown
Feast: 23 November (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Born
—
unknown
Died
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unknown
Beatified
—
not on record
Canonised
—
not on record
Who they were
At Cyzicus on the Hellespont, in present-day Turkey, Saint Sisinnius, bishop and martyr, who, tradition says, after many torments was run through with the sword during the persecution of the emperor Diocletian.
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 23 November as a bishop of Cyzicus who, tradition says, was put to the sword after many torments in Diocletian's persecution.
Sources
- Roman Martyrology, 23 November (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q134474969 — dates, feast day and identifiers (CC0)
Checked against the sources listed on 22 September 2026. Corrections welcome.