William of Aumelas (or Omelas) was the second son of William V of Montpellier and of Ermessende, daughter of count Peter of Melgueil.
The lordship of Aumelas (the Aumeladez) was detached from the territories of Montpellier to create a property for him.
At some date after 1118 he married Tiburge, Countess of Orange, daughter and heiress of Raimbaut, count of Orange.
[1] He fell ill and made his will on 7 March 1155.
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