Frederick II of Dießen (also known as "Frederick I of Regensburg"; 1005 – 1075) was a German nobleman. 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.
Life.
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 mother was Hemma, 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.
Marriages and issue.
Frederick married three times: