No likeness on file
Martyrius of Constantinople
subdeacon and martyr at Constantinople
SaintResearchedDate unknown
Feast: 25 October (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 Constantinople, Saints Martyrius, subdeacon, and Marcian, cantor, killed by the Arians under the emperor Constantius.
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 25 October as a subdeacon at Constantinople killed by the Arians under the emperor Constantius.
Sources
- Roman Martyrology, 25 October (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q40757968 — dates, feast day and identifiers (CC0)
Checked against the sources listed on 22 September 2026. Corrections welcome.