Can we fill in any details?
https://en.wikipedia.org/wiki/Adelog_of_Hildesheim
Adelog von Dorstadt (died 20 September 1190) was Bishop of Hildesheim from 1171 until his death.[1]. Born into a Saxon noble family, he was a relative of the Lords of Dorstadt.
https://en.wikipedia.org/wiki/Dorstadt
The settlement was first mentioned in an 1110 deed, when Bishop Udo of Bishopric of Hildesheim granted the episcopal fortress at Schladen to the Saxon noble Eiko of Dorstadt.
Geni is showing Eiko as a father of Dietrich von Dorstadt
Is this valid?
Tagging:
This tree has good citations, starting with https://finnholbek.dk/getperson.php?personID=I79018&tree=2
This site https://arts.st-andrews.ac.uk/monasticmatrix/monasticon/dorstadt:
The noble Arnold of Dorstadt, brother of Bishop Adelog of Hildesheim, bequeathed his brother Heinrich the task of founding a convent. Heinrich of Dorstadt founded the convent in 1189 from his own property for the worship of the Holy Cross. The foundation was confirmed by Bishop Adelog, and the community of Augustinian women was formed (Hoogeweg, 28-29).
So were they actual brothers?
Arnold
Adelog
Heinrich