Nielsen Hayden genealogy
Family: Robert Salvain / Sibyl de Thirkleby (F2561)
m. Bef 1267Gerard Salvain (1200-1254) 
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| Walter de Thirkleby ( -1266) |
| Robert Salvain (1234-1286)
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Sibyl de Thirkleby ( -1294)
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Gerard Salvain ( -1320)  |