Background
His father was Count Frederick of Dießen (d c 1030), a relative of the legendary Bavarian count Rasso (d 954), who administered the area around Dießen and Haching.
His father was Count Frederick of Dießen (d c 1030), a relative of the legendary Bavarian count Rasso (d 954), who administered the area around Dießen and Haching.
He is documented as bailiff (Vogt) of the Regensburg cathedral chapter in 1035. He is one of the earliest known ancestors of the Counts of Andechs. His mother was, a daughter of Duke Conrad I of Swabia.
He became Domvogt of Regensburg in 1035.
In 1055, he became Count in the Sempt area. He died in 1075, as a lay brother in the Sankt Blasien Abbey in the Black Forest.