In 839 he was already a monk at the Abbey of Prüm, where he was head of the school. About this date Abbot Markward commissioned him to rewrite the old Life of St. Goar and to supplement it by an account of the miracles worked by the saint. It originated in the desire to perpetuate the fame of St. Goar, whose cell on the Rhine was given to the monastery of Prüm by King Pepin. The life Wandalbert wrote is not without historical value.
