The Visitation of the County of Nottingham In the Years 1569 and
1614, edited by G.W. Marshall 1871, Publications of the Harleian
Society, vol. 4, p. 145. Sir Edmond Willoughby Knight [alive in the
fourth year of the reign of Henry IV, i.e. 1403].
B. Burke 1888, The Complete Peerage, p. 1118.
Sir Edmond Willoughby (living 4 Henry IV); ancestor of Willoughby of
Wollaton, son of Sir Richard Willoughby, Knight of Wollaton.