It is certain that his brother, or nephew, Leopold I, Margrave of Austria was the founder of the Younger or Austrian House of Babenberg.
The Comes Bertholdus who was mentioned in 941, was tasked by Emperor Otto I with guarding Lothar II, Count of Walbeck, who had been taken prisoner.
Lothar was pardoned the following year, and Berthold married his daughter Eilika (d. 19 August 1015).
In 973, Berthold participated in the ousting of the rebellious Henry II, Duke of Bavaria.
They had at least two children: In 1010, a lady named Eilika was abbess of Niedernburg Abbey in Passau.