Catholic Encyclopedia
St. Bertin, monk living under the Rule of St. Columban, missionary to the Morini, monastic founder, abbot of St. Omer, d. about 709.
For All the Saints
Biography of St. Bertinus of Sithiu claims that he was a Benedictine first, and later used the Rule of St. Columban in his own monastery. Also known as St. Bercht.