Nielsen Hayden genealogy
Family: John fitz Gilbert / Sybil de Salisbury (F6304)
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Male
John fitz Gilbert
Birth Bef 1109 of Cherhill, Wiltshire, England 
Death Bef 29 Sep 1165 Burial Marriage Other Spouse Aline Pipard | F1566 Marriage Other Spouse Alice de Coleville | F2198 Marriage Father Gilbert | F3561 Group Sheet Mother
Female
Sybil de Salisbury
Birth Death Burial Father Walter of Salisbury | F4048 Group Sheet Mother Sybil de Chaworth | F4048 Group Sheet
Male
William Marshal
Birth Abt 1146 Death 14 May 1219 Caversham, Oxfordshire, England Burial Temple Church, London, England Spouse Isabel de Clare | F5382 Marriage Aug 1189 London, England