Diessen is hypothesized to be the birthplace Deusone of the Gallic Emperor Postumus.
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.
She spent most of her childhood in Dießen – Bavaria, the second of four children born to Josef and Gabi Bertram.