The noble family originally resided in southwestern Bavaria at the castle of Ambras near Innsbruck, controlling the road to the March of Verona across the Brenner Pass, at Dießen am Ammersee and Wolfratshausen.
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He served as vogt of Benediktbeuern Abbey and by marriage with Sophie, daughter of Margrave Poppo II, came into property of lands in the March of Istria and Carniola.
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####Mechtild (d.1245), married to Count Frederick I of Hohenburg, secondly to Count Engelbert III of Görz
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The Counts of Dießen-Andechs (~1100 to 1180) obtained territories in northern Dalmatia on the Adriatic seacoast, where they became Margraves of Istria and ultimately Dukes of a short-lived Imperial State named Merania from 1180 to 1248.
Counts of Celje | Andechs | Counts of Ortenburg | Counts of Eu | Cabinet of Three Counts | Andechs Abbey | Counts of Vianden | Counts of Schauenburg and Holstein | counts of Celje | Counts of Andechs | Counts and Dukes of Rethel | Counts and dukes of Rethel | Counts and Dukes of Nevers | Counts and Dukes of Guelders | Counts and Dukes of Alençon |
After the line had become extinct in 1209, the possessions passed to the Carniolan margraves from the Bavarian House of Andechs, Dukes of Merania, and were finally acquired for the House of Habsburg by Archduke Rudolf IV of Austria, who proclaimed himself Duke of Carniola in 1364.
The town was among the most influential centers of power for the Bavarian counts of Andechs in the region of Carniola at the time.
The shape of the future however was made plain with the appointment to this Bavarian abbey in 1189 of Abbot Manegold of Berg, son of the Count of Berg, as the result of political intrigue by the Counts of Andechs, Vögte (lords protectors) of Tegernsee, and Bishop Otto of Freising.