Nielsen Hayden genealogy
Family: John Giffard / Maud de Clifford (F6453)
m. Bef 10 Mar 1271Elias IV Giffard (1170-1248) 
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| Walter IV de Clifford ( -1263)
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Margaret ferch Llewelyn ( -1265)
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| John Giffard (1232-1299)
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| Maud de Clifford ( -1282)
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Katherine Giffard (1272-1322)  |
| Eleanor Giffard (1275-1324) |