According to some 11th century sources Gondulph's predecessor
Monulph transferred the
episcopal see from
Tongeren to
Maastricht. However, the official title
episcopus Tungrorum (bishop of Tongeren) was retained until the 10th century, although the episcopal see had by that time been transferred from Maastricht to
Liège. Monulph must have occupied the See of Tongeren-Maastricht until the end of the 6th, beginning of the 7th century, because a bishop of Maastricht named Betulph (Betulphus) was present at the
Council of Paris in 614. Gondulph then could have been inserted between Monulph and Betulphus, at least if Betulphus is not identified with Gondulph. The case is similar to the situation in the
Archbishopric of Mainz, where Bertulfus and Crotoldus seem to be identical. Furthermore, the disputed episcopal lists of the 11th and 12th centuries ignore the historically attested Betulphus and make Gondulph the immediate successor of Monulph. The biographies of Gondulph from the Middle Ages are largely extracts from the
Vita Servatii, written by the 11th-century French priest Jocundus more than four centuries after Gondulph's death, and for that reason not reliable. == Ecclesiastical tradition ==