Who is XXX's mother?
Adela of Flanders
Adela of Flanders (c. 1064 -- April 1115), also known as Ailanda, was Queen consort of Denmark as the wife of King Canute IV and Duchess consort of Apulia as the wife of Duke Roger Borsa, and then minor regent of Apulia from 1111 to 1115 as mother and guardian of Duke William II. Adela was born the daughter of Robert I, Count of Flanders, and Gertrude of Saxony.
Gertrude of Saxony