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.
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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.
Rivalling with the Dukes of Merania from the comital House of Andechs, his descendants would gain further territory in inner Istria around Pazin (Mitterburg).
In the early 13th century, the Carinthian duke Bernhard von Spanheim established the Fons Sanctae Mariae Cistercian Abbey on the southern frontier of the March of Carniola, which he claimed against the resistance of the Patriarchs of Aquileia and the Dukes of Merania.