He is believed to have spent time at Rothesay on the Isle of Bute in Scotland, where a church was dedicated to him and his name was commemorated in the annual St. Bruix Fair.

He then traveled to Upper Brittany where he established an oratory at St Brieuc-des-Vaux, between St. Malo and Land Triguier, where he eventually became the abbot of a monastery.

[1] Authorities differ as to date of Brioc's death, but it was probably in 502, or in the early years of the sixth century.

His Acta cites numerous miracles, especially his cure of Count Riguel, who gave Brioc his own Palace of Champ-du-Rouvre as also the whole manorial estates.

Brioc's relics were moved to the Church of Saints Sergius and Bacchus of Angers in 865, and again, in a more solemn manner, on 31 July 1166.