Question: When is William D'Aubigny, 2Nd Earl Of Arundel's mother's birthday?
Sentence (from "Adeliza of Louvain"): As his second marriage produced no children, the decision was made to leave the throne to his daughter, the Empress Matilda; an oath was sworn by the clergy, members of the royal family, including Adeliza, as well as English nobles to recognise Matilda as Henry's heir upon his death.
Relevant evidence: No