William FitzWilliam 
William was born in 1350 in Sprotbrough, Doncaster, Yorkshire, England. He died at the age of 48 on April 8th, 1398 in Emley, Wakefield, Yorkshire, England.1 General Notes
He was succeeded by his eldest son, Sir William; the 3rd son, Edmund, was ancestor of William FitzWilliam, created Earl of Southampton 1528. Sir William, the eldest son, married Maude, daughter of Sir Ralph de Cromwell, and died 8 Apr 1398. [Complete Peerage V:518-520 Note]
Details of William's family with Maud de Cromwell
1 Magna Carta Ancestry, by Douglas Richardson, 2005, Genealogical Publishing Co. @ 349
Further sources/citations:
Ancestral Roots of Certain American Colonists, 7th Edition, by Frederick Lewis Weis, additions by Walter Lee Shippard Jr., 1999 @ 210-36, http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=jweber&id=I36481
Further sources/citations:
Ancestral Roots of Certain American Colonists, 7th Edition, by Frederick Lewis Weis, additions by Walter Lee Shippard Jr., 1999 @ 210-36, http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=jweber&id=I36481
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