Gerard de Furnivalle, of Sheffield, co. York, dsp bef. 18 Oct 1261. [Magna Charta Sureties]
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Gerard de Furnivall(e) [elder son]; feudal Lord of Hallamshire; m. Maud (married 2nd c 1270 9th Earl of Warwick) of the 1088 created and died April 1301), eldest daughter of Sir John fitz Geoffrey and sister and eventual coheir of Sir Richard fitz John, of Shere and Fambridge, and dsp by 18 Oct 1261. [Burke's Peerage]
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Note: Despite MCS & Burke's, I have a daughter for Gerard.