William Ferrers, 1st Baron Ferrers of Groby (31 January 1272 – 20 Mar 1325) was an English peer who lived under two kings, Edward I and Edward II. His baronial caput was Groby in Leicestershire.
^Cokayne, G. E.; Gibbs, Vicary & Doubleday, H. A., eds. (1926). The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct or dormant (Eardley of Spalding to Goojerat). 5 (2nd ed.). London, p.343, note (c)