Family
ClaimDetailEvidence
FatherWilliam VIII, Duke of Aquitaine (1023-1086) [S756] [S929]
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MotherHildegarde de Bourgogne (e1050-) [S756] [S929]
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Spouse 1stErmengarde d’Anjou (~1068-1146) 
Spouse 2ndPhilippa de Toulouse (~1079-1117) 
Child +William X, Duke of Aquitaine (1099-1137) [S756] [S929]
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Attributes
ClaimDetailEvidence
GenderMale
NameWilliam IX, Duke of Aquitaine [S756]
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NameWilliam VII, of Poitou [S756]
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NameWilliam IX, of Aquitaine [S756]
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NameWilliam VII, of Poitou, Count of Poitou [S756]
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NameWilliam IX, of Aquitaine, Duke of Aquitaine [S756]
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NameGuillaume IX, Duke of Aquitaine [S897] [S903] [S915] [S929] [S1539]
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NameGuillaume VII, Comte de Poitou [S897] [S903] [S915]
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NameGuillaume d'Aquitaine [S929]
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FatherWilliam VIII, Duke of Aquitaine (1023-1086) [S756] [S929]
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MotherHildegarde de Bourgogne (e1050-) [S756] [S929]
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Timeline
ClaimDateDetailAgeEvidence
BirthOct 22, 1071France [S756] [S897] [S929]
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Title1086Count of Poitou [S756] [S903] [S929]
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Title1086Duke of Aquitaine [S756] [S903] [S929]
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Marriage 1st1089Ermengarde d’Anjou (~1068-1146) [S929] [S1539]
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Divorce1090Ermengarde d’Anjou (~1068-1146) [S915] [S929] [S1539]
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Marriage 2nd1094Philippa de Toulouse (~1079-1117) [S756] [S897] [S929]
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Flourished1101 [S756] [S929]
Crusader
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Divorce1115Philippa de Toulouse (~1079-1117) [S897] [S929]
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DeathFeb 10, 1126/27 [S756] [S897] [S929]
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Sources
IndexTitle
[S756] Weis, Frederick Lewis, "Ancestral Roots of Sixty Colonists Who Came To New England before 1700, 7th Ed." (Genealogical Publishing Co., Inc., Baltimore, 1999).
[S897] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Toulouse)" (2006-7 (v1.1 Updated 02 November 2006)) (https://fmg.ac/Projects/MedLands/TOULOUSE.htm).
[S903] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Aquitaine Nobility)" (2006-7 (v1.4 Updated 18 July 2007)) (https://fmg.ac/Projects/MedLands/AQUITAINE NOBILITY.htm).
[S915] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Brittany: Dukes)" (2006-7 (v1.3 Updated 21 July 2007)) (https://fmg.ac/Projects/MedLands/BRITTANY.htm).
[S929] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Aquitiane Dukes)" (2006-7 (v1.3 Updated 18 July 2007)) (https://fmg.ac/Projects/MedLands/AQUITAINE.htm).
[S1539] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Anjou Counts)" (v1.5 Updated 16 March 2010) (https://fmg.ac/Projects/MedLands/ANJOU, MAINE.htm).
Kinship Lines for William IX, Duke of Aquitaine
Spouse/PartnerDegreeRelationshipMRCA
Ermengarde d’Anjou (~1068-1146)41st CousinErmengarde d’Anjou (~1018-1076)
Ermengarde d’Anjou (~1068-1146)72nd Cousin 1x removedErmentrude de Roucy (~952-~1004)
Philippa de Toulouse (~1079-1117)83rd CousinAdelais d’Anjou (~940-1026)
Philippa de Toulouse (~1079-1117)104th CousinBoson Comte d’Arles (e902-~967)
Philippa de Toulouse (~1079-1117)104th CousinConstance of Provence (e903-~965)