Frederick I, Duke of Swabia
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Frederick I von Staufen (1050 – July 21 1105) was duke of Swabia from 1079 to his death. He was the first ruler of Swabia of the House of Hohenstaufen. In 1089, Frederick married Agnes of Germany, daughter of Henry IV, Holy Roman Emperor. They had several sons and daughters, amongst whom were:
- Frederick II of Swabia (1090-1147), the father of Frederick Barbarossa
- Conrad III, king of Germany (1093-1152)
See also: Dukes of Swabia family tree
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