Picture: G.Garitan · CC BY-SA 3.0 · Wikimedia Commons
John de Montmirail
French noble
BlessedResearchedFranceBenedictines
Feast: 29 September (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Born
1165
Died
1217
Beatified
—
not needed: before formal processes
Canonised
—
not yet
Who they were
In the Cistercian monastery of Longpont in France, Blessed John de Montmirail, who from a most illustrious knight became a humble monk.
The miracles
The Roman Martyrology does not describe the miracles approved in the cause.
Why that counted as sanctity
The Roman Martyrology remembers him on 29 September as a famous knight who became a humble Cistercian monk at Longpont.
Sources
- Roman Martyrology, 29 September (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q3175596 — dates, feast day and identifiers (CC0)
- English Wikipedia — Jean de Montmirail (CC BY-SA)
Checked against the sources listed on 22 September 2026. Corrections welcome.