Heinrich IX Duke of Bavaria the Black

✓ Heinrich IX 'der Schwarze', Duke of Bavaria (d. 13 Dec 1126), son of Welf IV by Judith of Flanders; m. Wulfhild, da. of Magnus Billung, Duke of Saxony (Annalista Saxo: Wulfhild married 'Heinrico duci, filio Welfi ducis senioris de Bawaria'); father of Henry the Proud, Welf VI and four daughters, of whom Judith married Frederick, Duke of Swabia (Historia Welforum: 'Iuditham, Sophiam, Mahtildem, Wulfildem' daughters of 'Heinricus dux ex Wulfilde'). Source: Medieval Lands (fmg.ac, Cawley), read 2 Nov 2026: 'Bavaria, Dukes' (Welf). [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.]