Hezzelin I, also Hezelo (Heinrich, m. a daughter of Conrad I, Duke of Carinthia), was Vogt of Kornelimünster
Returning to his home diocese, he then worked in the general vicariate, as well as being an auxiliary priest appointed to support the parishes of Kornelimünster/Walheim and Venwegen.
In 1971 Kornelimünster joined together with other area communities such as Breinig, Mulartshütte, Roetgen, Venwegen and Walheim to argue in favor of creating a Münsterland district.
Montebourg (France), a sister city of Walheim since 1960, which was carried over to the district after Kornelimünster and Walheim were merged in 1972.
The Ancient Romans, supported by a small Roman road connecting Kornelimünster and Jülich, started mining in the southeast of Büsbach as traces of settlements from the first to third century proved.