Berthold I, Duke of Swabia
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Berthold I better known as Berthold of Rheinfelden, was the Duke of Swabia
Duke of Swabia
The following is a list of Dukes of Swabia in southwest Germany.Swabia was one of the five stem duchies of the medieval German kingdom, and its dukes were thus among the most powerful magnates of Germany. The most notable family to hold Swabia were the Hohenstaufen, who held it, with a brief...

 from 1079 until his death. He was the only son of Rudolf of Rheinfelden, the German anti-king who opposed the Emperor Henry IV.

Berthold's mother's name is unknown, but on her death in 1079, Rudolf needed a new supervisor of the south German resistance, since he was himself confined to Saxony and cut off from his allies in Swabia. Rudolf therefore made his son Duke of Swabia. Henry, however, appointed Frederick of Büren
Frederick I, Duke of Swabia
Frederick I von Staufen was Duke of Swabia from 1079 to his death. He was the first ruler of Swabia from the House of Hohenstaufen, and was the builder of dynasty's ancestral Hohenstaufen Castle near Göppingen.-Parents:...

, who had lands strategically located much to his advantage, Duke.

Throughout the civil war against Henry, Swabia was in the heart of the chaos. In 1084, Berthold was besieged by supporters of Henry IV. Though he had a larger power base, he remained of low profile. He eventually left the fight to Berthold of Zähringen
Berthold II, Duke of Swabia
Berthold II was the Duke of Swabia from 1092 to 1098.Berthold was a son of Berthold II, Duke of Carinthia and initially supported Rudolf of Rheinfelden against King Henry IV. Both the Zähringer and Rheinfeldener were relieved of their titles and possessions by the king in 1077...

 and Welf IV. When he died without descendants in 1090 and was buried in the monastery of Saint Blaise, Berthold succeeded him as duke.
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