William VIII Count of Gascony
William VIII was born in 1058.  He died at the age of 28 in 1086.

 Princess Hildegarde of France
Princess Hildegarde was born in 1049.  She died at the age of 55 in 1104.

 William IX Duke of Aquitaine The Troubadour
William IX was born in 1086.  He died at the age of 41 in 1127.