Nielsen Hayden genealogy
Family: John Mowbray / Elizabeth de Segrave (F4245)
m. Aft 25 Mar 1349John de Mowbray (1310-1361) 
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Joan of Lancaster (1312-1346)
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| John de Segrave (1315-1353)
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| Margaret Marshal (1322-1399)
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| John Mowbray (1340-1368)
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| Elizabeth de Segrave (1338-1364)
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Joan Mowbray ( -1408)  |
| Eleanor Mowbray (1360- ) |
| Thomas Mowbray (1367-1399) |