Family: Sir Sir Robert de Willoughby / Margaret Deincourt (fam06509)
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 | Sir Sir William de Willoughby (1245-1300)
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 | Alice de Beke (1254-1311)
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| Thomas de Willoughby de Mumby (1268- )  |
| Sir Sir Edmund Deincourt, 8th Lord Deincourt (1244-1326)
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| Isabel de Mohun (1248-1280)
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| John Deincourt, 9th Lord Deincourt (1266- ) |
| Isabel Deincourt (1274- ) |
| Sir Sir Robert de Willoughby (1260-1317)
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| Margaret Deincourt (1278-1333)
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| Sir Sir Richard Willoughby (1305-1362) |
| Nicholas Willoughby (1309- ) |
| Mary Mariota Willoughby (1314- ) |