abbot. A monk of Luxeuil who helped Omer to evangelize the Pas-de-Calais district in northern France, Bertin became abbot of Sithiu, called Saint-Bertin after his death, which was an important centre for missionary work and agriculture. In 663 Bertin and Omer built the church which later became the cathedral of Saint-Omer. Frequent visits by English ecclesiastics on their way to or from Rome in the late Anglo-Saxon and early Norman periods led to the introduction of the cult of Bertin into England. His relics were restored to Saint-Bertin in 1052 after being removed, like many others, to a place of safety during the invasions of the Northmen. His iconographical attribute is a boat, because Sithiu was originally accessible only by water. Feast: 5 September.
AA.SS. Sept. II (1748), 549–630;M.G.H., Scriptores rerum merov., v. 729–80;L. van der Essen, Étude sur les Vitae des saints mérovingiens de l'ancienne Belgique (1907), 400–11.