Although he was the father of two children by Charlemagne's daughter, Bertha, one of them named Nithard, we have no authentic account of his marriage, and from 790 he was abbot of St Riquier, where his brilliant rule gained for him later the renown of a saint.
Angilbert, abbot of St Riquier (c. 814), records that it was sung by his school in procession on rogation days.
At that time belonging to the abbey of St Riquier, it was afterwards governed by the counts of Ponthieu.
Riquier and Fontanelle; a collection of tales relating to the reign of the emperor Henry III.; and the lives of various saints.