Saint Tadec
Feast: 2 December (not on the universal Roman calendar; kept in the Roman Martyrology or local calendars)
Who they were
Tadec, also called Tudec, is a half-legendary saint of Brittany, a monk of the abbey of Landevennec in the sixth century. He is one of the Breton saints who have never been formally recognised by the Catholic Church, and his day is 2 December.
The story told of him is that a lord of Le Faou, still a pagan, broke down the doors of the church at Daoulas where the heads of the monasteries of Cornouaille had gathered. Tadec was killed at the altar as he was saying Mass, and his companion Judulus was beheaded as he fled towards Landevennec; the same account says the murderer was later converted and founded the monastery of Daoulas in reparation.
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
A monk of Landevennec remembered as killed at the altar at Daoulas.
- Wikipedia (French) - Saint Tadec, translated (CC BY-SA 4.0)
- Calendrier des saints bretons, Diocese de Saint-Brieuc et Treguier (hosted by Nominis, Conference des eveques de France) - 2 decembre: St Tudeg — FLAG FOR REVIEW. The diocesan Breton calendar lists 'St Tudeg' on 2 December, exactly the page's feast day; Tudeg/Tudec is the Breton form of Tadec. Against this, French Wikipedia calls him a semi-legendary Breton saint
- Wikidata Q3464087 — dates, feast day and identifiers (CC0)
Checked against the sources listed on 22 September 2026. Corrections welcome.