Willibrod, St., the “Apostle of the Frisians,” born in Northumbria; was the chief of a company of 12 monks who went as missionaries from Ireland to Friesland, where they were welcomed by Pépin d'Héristal, and afterwards favoured by his son, Charles Martel; he founded an abbey near Trèves; when he was about to baptize the Duke of Friesland, it is said the duke turned away when he was told his ancestors were in hell, saying he would rather be with them there than in heaven without them (658‒739).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Williams, Rowland * Willis, Parker