No likeness on file
Gerulf
adolescent martyr at Tronchiennes
SaintFull write-upDate unknown
Feast: 21 September (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 Tronchiennes in Flanders, in present-day Belgium, Saint Gerulf, martyr, an adolescent.
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 21 September as an adolescent martyr at Tronchiennes in Flanders, in present-day Belgium.
Sources
- Roman Martyrology, 21 September (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q2377089 — dates, feast day and identifiers (CC0)
Checked against the sources listed on 22 September 2026. Corrections welcome.