Friedrich I Duke of Swabia

✓ Friedrich I von Staufen ('von Buren'), Duke of Swabia ([1050]-1105), son of Friedrich von Buren by Hildegard; builder of Hohenstaufen ('qui Stophen condidit'); betrothed 1079, m. 1089 Agnes, da. of Emperor Henry IV by Bertha of Savoy; father of Friedrich II. RING: Agnes of Germany (I101369) is already in the tree as da. of Henry IV x Bertha of Savoy. Source: Medieval Lands (fmg.ac, Cawley), read 2 Nov 2026: 'Swabia, Dukes'. [DIRECT ANCESTOR OF THE COMPILER: flag added 2 Nov 2026 by walking the tree from Aynsley, so that this marker is reliable and can be searched.]