Adela was born about 1110 and was the daughter of William III, Count of Ponthieu, also seigneur de Montgomery, and Helie of Burgundy.
[2] The Gesta Normannorum Ducum records that she had three brothers and a sister.
Her paternal grandparents were Robert II of Bellême and Agnes, Countess of Ponthieu.
[4] Adela firstly married William de Warenne, 3rd Earl of Surrey.
[5] They had one daughter and sole heiress: Her first husband William died in January 1148 at the Battle of Mount Cadmus near Laodicea while on crusade with his half-brother Waleran de Beaumont, Count of Meulan, and their second cousin, King Louis VII of France.