Frederick II, Count of Diessen

Frederick II
Count of Dießen
Born	1005
Died	1075 St. Blaise Abbey
Buried	Seeon Abbey
Noble family	House of Andechs
Spouse(s)	Hadamut of Eppenstein Irmgard of Gilching Tuta of Regensburg
Father	Frederick of Dießen
Mother	Hemma of Swabia

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.

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.

Frederick married three times:

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