The eldest known ancestor of the Delius family was Johannes Delius, pastor in Kleinenbremen. He lived from about 1554 to 1637. His great-grandson, Johann Daniel Delius (1670 – 1707), bailiff at Berenkämpen, is considered as progenitor of the Westphalian line of the Delius family. 14 children, 10 sons and 4 daughters, come from his marriage with Anna Katharina Meinders, widowed Nottelmann. We are not informed about the whereabouts of two sons, Christian Heinrich Delius (IVa, 5) and August Delius (IVa, 12), likewise we did not hear from possible descendants of Friedrich Adolf Delius (IVa, 7).
The other seven sons of Johann Daniel Delius founded seven boughs of the Westphalian line differing greatly in extension and ramifications.