Adelaide del Vasto (Adelasia, Azalaïs) (c. 1075 – April 16, 1118) was the third wife of Roger I of Sicily and mother of Roger II of Sicily, as well as Queen consort of Jerusalem due to her later marriage to Baldwin I of Jerusalem, as his third wife.
She was the daughter of Boniface del Vasto, marquess of Western Liguria, and Agnes of Vermandois. Her father's family was a branch of the Aleramici, sharing a common descent from Aleramo of Montferrat with the Marquesses of Montferrat. Her brothers founded the lines of the Marquesses of Saluzzo, of Busca, of Lancia, of Ceva, and of Savona.
Who is wrong?
The profile for the Adelaide you are referring to is here:
Adelaide del Vasto, Queen consort of Jerusalem
She married the King of Sicily and then the King of Jerusalem.
However, you have her parents wrong. The parents in the profile shown are correct, She was NOT the daughter of Boniface del Vasto, marquess of Western Liguria, and Agnes of Vermandois.
All this in accordance with Medlands.
There are a lot of similar names among these families and it is easy to confuse them.
Bernard Albanese