Family: William De Muer / Agnes De Willoughby (F1515)
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 | Thomas de Willoughby (1268-1300)
|
 | Margaret De Mumby (1270- ) |
| William De Muer (1250-1330) |
| Agnes De Willoughby (1260-1296)
|
| Ralph De Muer (1284-1332) |