William was the son of William Fitz Alan and Christiana (stepmother was Isabella de Say).
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William FitzAlan, 16th Earl of Arundel (1417 – 1487), a descendant of the FitzAlans of Oswestry.
He was the eldest son and heir of Alan fitz Flaad, a Breton noble whose family were closely associated with the sacred environs of Dol-de-Bretagne, close to the border with Normandy and a short distance south-west of the great abbey of Mont Saint-Michel.