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Padre de Frederick II von Harzgau, Graf im Harzgau
Hermano de: Adelgar im Liesgau
A German text I found (by Karl Hopf, 1858) suggested that this Bia is probably Bia von Ammensleben. It is one of two places that I have seen her referenced, but find no other proof. Everything else has left her surname blank. Looking her up individually rules her out, as she was born in/about 1109, whereas this Bia died prior.