William IX of Poitou, duke of Aquitaine L XI / E XII
Willelmus Aquitanie dux (Riley-Smith p. 225) (William 4014)
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- father of Raymond 17001
- (filius). William of Tyre bk. 14, 9.17-18
- kin of Henry 54
- de sanguine et origine. Albert of Aachen VIII.34
- kin of Radulf 107
- cognatus. Albert of Aachen VIII.35