Nielsen Hayden genealogy
Descendants of William de Willoughby
- 1227
William de Willoughby
(of Sloothby in Willoughby in the Marsh, Lincolnshire, England - Between 1225 and 1227)
   └─ Robert de Willoughby ( - Between 3 Feb 1257 and 21 Feb 1258)
   
       └─ William de Willoughby ( - Between Sep 1290 and 29 Mar 1300)
        Alice Beke ( - Bef May 1311)(m. Between 1250 and 1260)
           └─ Robert de Willoughby (Between 1250 and 1260 - Bef 25 Mar 1317) =>
            + Margaret Deincourt ( - Bef 18 Oct 1333)(m. Bef 1304)