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Cosconius
martyr at Nicaea
SaintFull write-upDate unknown
Feast: 18 January (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 Nicaea in Bithynia, in present-day Turkey, Saints Cosconius, Zeno and Melanippus, martyrs.
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 January as a martyr at Nicaea in Bithynia, in present-day Turkey.
Sources
Checked against the sources listed on 22 September 2026. Corrections welcome.