Sir William Willoughby (~1230 - <1300)	Edmund Deincourt Lord, 8th Baron (1236 - 1325)
Alice Beke (~1240 - )	Isabel de Mohun (~1245 - )

m. bef 1303, Of Willoughby, D'eresby, Lincolnshire, England

Sir Robert Willoughby

Margaret Deincourt

b. abt 1270/1273, Of Willoughby, D'eresby, Lincolnshire, England d. bef 25 Mar 1317 bur. occ. cen. im. . ud.

b. abt 1275, Of Blankney, Lincolnshire, England d. bef 18 Oct 1333, Of Willoughby, D'eresby, Lincolnshire, England bur. occ. cen. im. . ud.

Children

John Willoughby 2nd Lord Willoughby d' Eresby Joan de Willoughby

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