Pierre de Castelnau
French ecclesiastic ca 1170-1208
Feast: 15 January (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Who they were
Pierre de Castelnau was born in the Diocese of Montpellier and became Archdeacon of Maguelonne. In 1199 Pope Innocent III sent him with two Cistercians as papal legate to work for the conversion of the Albigensians, and about 1202 he himself took the Cistercian habit at Fontfroide, near Narbonne.
Confirmed as papal legate, he laboured tirelessly, strengthening those untouched by the heresy, gently winning back those who showed good will and censuring the obstinate. While trying to reconcile Raymond, Count of Toulouse, he was run through with a lance on the count's orders, and as he fell he cried, 'May God forgive you as I do.' He died on 15 January 1208 and is honoured as a martyr.
The miracles
As a martyr he was raised to the altars without a miracle.
Why that counted as sanctity
A Cistercian papal legate killed while working to win back the Albigensians.
The cause
The cause continues. No postulation address is published here yet. Favours received through this person’s intercession, and offers of help, are best sent to the religious order or congregation they belonged to, or to the diocese where the cause was opened; either will pass them to the postulation.
- Catholic Encyclopedia (1913), via New Advent - Blessed Pierre de Castelnau
- Roman Martyrology, 15 January (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q542518 — dates, feast day and identifiers (CC0)
- English Wikipedia — Pierre de Castelnau (CC BY-SA)
Checked against the sources listed on 22 September 2026. Corrections welcome.