Picture: Vassil · Public domain · Wikimedia Commons
Maternus of Cologne
Roman-Catholic saint and Bishop and founder of the diocese of Tongeren.
SaintResearchedAncient RomePre-congregation
Feast: 14 September (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Born
300
Died
328
Beatified
—
not needed: before formal processes
Canonised
By tradition
recognised before formal processes began
Who they were
At Cologne, in Germany, Saint Maternus, bishop, who led the inhabitants of Tongeren, Cologne and Trier to faith in Christ.
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 14 September as a bishop who brought Tongeren, Cologne and Trier to faith in Christ.
Sources
- Roman Martyrology, 14 September (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q511623 — dates, feast day and identifiers (CC0)
- English Wikipedia — Maternus of Cologne (CC BY-SA)
Checked against the sources listed on 22 September 2026. Corrections welcome.