William FitzWilliam , of Sprotborough ,Sir Knight 
William was born about 1232 in Emley, Wakefield, Yorkshire, England. William's father was Thomas FitzWilliam , of Sprotborough & Emley and his mother was Agnes Bertram. He had two sisters named Dionise and Margery. He was the second oldest of the three children. He died before 1294 in Sprotbrough, Doncaster, Yorkshire, England.General Notes
His [Thomas FitzWilliam's] son, Sir William FitzThomas, was dead in 1294. [Complete Peerage V:518-520 Note]
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Sir William Fitz-William, of Sprotborough, who, in the 29th Edward I [1301], was in the Scottish wars but the next reign, joining in the great insurrection of Thomas, Earl of Lancaster, he was made prisoner with that nobleman at Boroughbridge, and hanged immediately after at York. He m. Agnes, dau. of Richard, Lord Grey, of Codnor, and left an only son, Sir William Fitz-William. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 216, Fitz-William, Baron Fitz-William]
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From Sir William Fitz-William, son of William Fitz-Godrick, marshall of the victorious army at Hastings, descended Sir William Fitz-William, who m. Agnes, dau. of Richard Lord Grey, of Codnor, and had issue, a son, Sir William Fitz-William. [Sir Bernard Burke, Dormant, Abeyant, Forfeited and Extinct Peerages, Burke's Peerage, Ltd., London, England, 1883, p. 216, Fitz-William, Earl of Southampton]
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