No likeness on file
Gaius of Moesia
martyr at Vidin
SaintFull write-upDate unknown
Feast: 4 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
In Moesia, in the lands lying today between Romania and Bulgaria, Saints Hermes and Gaius, martyrs, the first at Arcer, the other at Vidin.
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 4 January as a martyr at Vidin in Moesia, in the lands lying today between Romania and Bulgaria.
Sources
Checked against the sources listed on 22 September 2026. Corrections welcome.