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Male William Longespee Click to view William Longespee in the family tree

William was born in 1176.1   William's father was Henry and his mother was Eleanor of Aquitaine.  His paternal grandparents were Geoffrey Plantagenet and Matilda Unknown; his maternal grandparents were William X and Aenor Of Chatellerault. He had four brothers and a sister, named Henry, Goffery, Richard, John and Eleanor Of. He had six half-brothers and two half-sisters, named William Prince Of, Henry Prince Of, Richard I "Coeur", Geoffrey Prince Of, Philip Prince Of, John "Lackland" King, Matilda Princess Of and Joanna Princess Of.1 

Family Details of William's family with Ela Unknown

1 phelps.FTW @ Tree #1353
Further sources/citations:
World Family Tree Vol. 4, Ed. 1 @ Tree #0574, 0574.ftw