"Egbert I (German: Ekbert) (died 11 January 1068) was the Margrave of Meissen from 1067 until his early death the next year. Egbert was the Count ...
of Brunswick from about 1038, when his father, Liudolf, Margrave of Frisia, died. His mother was Gertrude, the sister of Pope Leo IX.
Egbert was the scion of the influential Eastphalian family of the Brunonen. He inherited the familial lands in Brunswick and from about 1051 he shared the chief authority in the region with the Bishop of Hildesheim. Egbert also extended his authority and estates into Frisia under the suzerainty of the Archbishop of Hamburg-Bremen." - (en.wikipedia.org 13.03.2021)
