Count Bruno von Iverfort, I - These seems to be confusing

Is there any good sources for these profiles???

Count Bruno von Iverfort, I

Count Bruno I. von Arneburg, Graf von Arneburg

Frederuna

https://www.geni.com/people/Mathilde-von-Arneburg-Gräfin-von-Walbec...

I found this Googling "Bruno Count Von Iverfort" & "Bruno Count Von Arneburg" but it differs drastically from whats on here

[https://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=REG&db=srod...+ srodenbough]

1. Bruno Count Von Iverfort was born 865 in Saxony, Prussia, and died in Germany. He married Mrs Bruno Von Iverfort. She was born 865 in Saxony, Prussia.

Child of Bruno Count Von Iverfort and Mrs Bruno Von Iverfort is:
* + 2 i. Bruno Count Von Arneburg was born 879 in Saxony, Prussia, and died 910 in Arneburg, Sachsen, Prussia.

Descendant Register, Generation No. 2

2. Bruno Count Von Arneburg (Bruno Count Von Iverfort1) was born 879 in Saxony, Prussia, and died 910 in Arneburg, Sachsen, Prussia.

He married Frederunda Von Ringelheim 906, daughter of Theudebert Theodoric in Saxony and Reginhilde von Friesland Von Haithabu. She was born 887 in Laon, Aisne, Picardie, France, and died 10 FEB 917 in Paris, Paris, �le-de-France, France.

Child of Bruno Count Von Arneburg and Frederunda Von Ringelheim is:
* + 3 i. Mathilda Von Arneburg was born 907 in Walbeck,Sachsen,,Prussia, and died 03 DEC 990 in Germany. She married Lothar III Graf von Walbeck und Stade, son of Lothar II Graf Von Walbeck und Stade and Swanhilde Suanhilde Von Hamaland. He was born 05 SEP 929 in Stade,Hannover,Sachsen,Germany, and died 03 DEC 991 in Lenzen,Hannover,Sachsen,Germany.