Thietmar of Merseburg reported that his grandfather Lothar participated in the plot to assassinate Emperor Otto I by his brother Henry on Easter 941 and lost all his property as a result.
He was imprisoned for a year at Imgelheim by Berthold of Schweinfurt, Count in the Radenzgau.
Lothar paid a heavy fine and founded the canon at Walbeck as atonement.
Berthold later married Lothar’s daughter Eilika.
Lothar married Mathilde von Arneburg, daughter of Bruno, Count of Arneburg, and Frederuna, daughter of Volkmar, Count of Harzgau.