Guillaume Courtet
French missionary
Feast: 28 September (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Who they were
At Nagasaki in Japan, the passion of the holy martyrs Michael de Aozaraza, Guillaume Courtet, Vincent Shiwozuka, priests of the Order of Preachers, Lazarus of Kyoto and Lorenzo Ruiz of Manila, father of a family, who, kept in prison for more than a year for the name of Christ, suffered the torture of the cross and finally beheading. Their memory, together with that of other companions, is celebrated on the preceding day.
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 Dominican priest martyred at Nagasaki after more than a year in prison.
Connected on this site
- Lorenzo Ruiz Saint“At Nagasaki in Japan, the passion of the holy martyrs Michael de Aozaraza, Guillaume Courtet, Vincent Shiwozuka, priests of the Order of Preachers, Lazarus of Kyoto and Lorenzo Ruiz of Manila, father of a family, who, kept in prison for more than a year for the name of Christ, suffered the torture of the cross and…” — this site's research
- Alfonso Navarrete Blessed“His example quickly became an inspiration to later missionaries to Japan from the Order of Preachers such as canonised saints Giordano Ansalone, Domingo Ibáñez de Erquicia, Guillaume Courtet, and Lorenzo Ruiz.” — Wikipedia
- Michael de Aozaraza Blessed“At Nagasaki in Japan, the passion of the holy martyrs Michael de Aozaraza, Guillaume Courtet, Vincent Shiwozuka, priests of the Order of Preachers, Lazarus of Kyoto and Lorenzo Ruiz of Manila, father of a family, who, kept in prison for more than a year for the name of Christ, suffered the torture of the cross and…” — this site's research
- Roman Martyrology, 29 September (Italian Bishops' Conference, Santo del giorno)
- Wikidata Q3119773 — dates, feast day and identifiers (CC0)
- English Wikipedia — Guillaume Courtet (CC BY-SA)
Checked against the sources listed on 22 September 2026. Corrections welcome.