Guy William Poitiers VIII Duke Aquitaine and Mateoda Unknown Duchess Aquitaine were married. She by marriage Duchess Aquitaine. He the son of William "Great" V Duke Aquitaine and Agnes Ivrea Duchess Aquitaine.

Guy William Poitiers VIII Duke Aquitaine and Garsende Perigord Duchess Aquitaine were married. She by marriage Duchess Aquitaine. He the son of William "Great" V Duke Aquitaine and Agnes Ivrea Duchess Aquitaine.

Guy William Poitiers VIII Duke Aquitaine and Hildegarde Burgundy Duchess Aquitaine were married. She by marriage Duchess Aquitaine. The difference in their ages was 31 years. She the daughter of Robert I Duke Burgundy and Ermengarde Blanche Ingelger Duchess Burgundy. He the son of William "Great" V Duke Aquitaine and Agnes Ivrea Duchess Aquitaine. They were second cousin once removed.

In or before 1004 [his father] William "Great" V Duke Aquitaine (age 35) and Adalemode Limoges Duchess Aquitaine were married. She by marriage Duchess Aquitaine. He the son of William "Proud Arm" IV Duke Aquitaine and Emma Blois Duchess Aquitaine.

In or before 1010 [his father] William "Great" V Duke Aquitaine (age 41) and Sancha Gascony Duchess Aquitaine were married. She by marriage Duchess Aquitaine. He the son of William "Proud Arm" IV Duke Aquitaine and Emma Blois Duchess Aquitaine.

In or before 1023 [his father] William "Great" V Duke Aquitaine (age 54) and [his mother] Agnes Ivrea Duchess Aquitaine were married. She by marriage Duchess Aquitaine. She the daughter of Otto William Ivrea I Count Burgundy (age 62) and Ermentrude Countess Burgundy. He the son of William "Proud Arm" IV Duke Aquitaine and Emma Blois Duchess Aquitaine.

In 1032 [his step-father] Geoffrey "Martel aka Hammer" Ingelger II Count Anjou and [his mother] Agnes Ivrea Duchess Aquitaine were married. She the daughter of Otto William Ivrea I Count Burgundy and Ermentrude Countess Burgundy. He the son of Fulk "Black" Ingelger III Count Anjou (age 62) and Hildegarde Sundgau Countess Anjou.

In 1069 [his son-in-law] Alfonso "Brave" VI King Leon VI King Castile (age 28) and [his daughter] Agnes Poitiers Queen Consort Leon Queen Consort Castile (age 17) were married. She the daughter of Guy William Poitiers VIII Duke Aquitaine (age 44) and Mateoda Unknown Duchess Aquitaine. He the son of Ferdinand "Great" I King Leon and Sancha Astur Leonese.

In 1086 [his son-in-law] Peter I King Aragon I King Pamplona (age 18) and [his daughter] Agnes Poitiers Queen Consort Aragon Queen Consort Pamplona (age 14) were married. She by marriage Queen Consort Aragon, Queen Consort Pamplona. She the daughter of Guy William Poitiers VIII Duke Aquitaine (age 61) and Hildegarde Burgundy Duchess Aquitaine (age 30). He the son of Sancho Ramírez I King Aragon V King Pamplona (age 44) and Isabella Urgell Queen Consort Aragon Queen Consort Pamplona.