William IX, Count of Poitiers

William was the first son of King Henry II of England and Duchess Eleanor of Aquitaine. He was born in Normandy on the same day that his father's rival, Eustace IV of Boulogne, died.

17 August 1153

Born on the same birth day (17 August): Christian Laettner • Dave "Snaker" Ray • Dee Brown (basketball, born 1984) • Erika Toda • Fredrika Bremer • Kelvin Mercer • Lothar Bisky • Mark Felt • Michael John Wise • Shane Porteous • Shaun Rehn • Stephan Eicher