Nielsen Hayden genealogy
Family: Roger la Warre / Eleanor de Mowbray (F19231)
m. Bef 23 Jul 1358John la Warre ( -1331) 
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Margaret de Holand ( -1349)
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| John de Mowbray (1310-1361)
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| Joan of Lancaster (1312-1349)
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John Mowbray (1340-1368)  |
| Roger la Warre (1326-1370)
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| Eleanor de Mowbray ( -1387)
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| Joan La Warre ( -1404) |