Nielsen Hayden genealogy
Ancestors of William de Say
1253 - Bef 1295 (< 41 years)
┌── Jordan de Say 
(of Aunay-sur-Odon, Calvados, France - ??) =>
(of Aunay-sur-Odon, Calvados, France - ??) => ┌── William de Say ( - Aug 1144 Burwell, Cambridgeshire, England)
( - Aug 1144 Burwell, Cambridgeshire, England) │ └── Lucy de Rumilly =>
=> │
┌── Geoffrey de Say (of Edmonton, Middlesex, England - Bef 19 May 1214)(m. Bef 1180)
(of Edmonton, Middlesex, England - Bef 19 May 1214)(m. Bef 1180) │ │
│ │ ┌── William I de Mandeville (of Great Waltham, Essex, England - Bef May 1116) =>
(of Great Waltham, Essex, England - Bef May 1116) => │ └── Beatrice de Mandeville (Abt 1105 - Bef 19 Apr 1197 Rickling, Saffron, Essex, England)
(Abt 1105 - Bef 19 Apr 1197 Rickling, Saffron, Essex, England) │ └── Margaret fitz Eudes =>
=> │
┌── Geoffrey de Say (Abt 1180 of Edmonton, Middlesex, England - 19 Aug 1230 Poitou, Aquitaine, France)
(Abt 1180 of Edmonton, Middlesex, England - 19 Aug 1230 Poitou, Aquitaine, France) │ (m. Bef 1215)
│ │
│ │ ┌── John de Cheyne (of Streat, Sussex, England - ??)
(of Streat, Sussex, England - ??) │ └── Alice de Cheyne ( - Aft 1184)(m. Bef 1180)
( - Aft 1184)(m. Bef 1180) │
┌── William de Say (of Edmonton, Middlesex, England - Bef 12 Feb 1272)
(of Edmonton, Middlesex, England - Bef 12 Feb 1272) │ │
│ │ ┌── Richard fitz Gilbert de Clare (Abt 1090 Hertford, Hertfordshire, England -
│ │ │ 15 Apr 1136 Abergavenny, Monmouthshire, Wales) =>
(Abt 1090 Hertford, Hertfordshire, England -│ │ │ 15 Apr 1136 Abergavenny, Monmouthshire, Wales) =>
│ │ ┌── Roger de Clare (1116 Tunbridge Castle, Kent, England -
│ │ │ 1173 bur.Stoke by Clare Priory, Suffolk, England)
(1116 Tunbridge Castle, Kent, England -│ │ │ 1173 bur.Stoke by Clare Priory, Suffolk, England)
│ │ │ └── Alice of Chester ( - Aft 1148) =>
( - Aft 1148) => │ │ │
│ │ ┌── Richard de Clare (Abt 1153 of Clare, Suffolk, England - Between 30 Oct 1217 and 28 Nov 1217)
(Abt 1153 of Clare, Suffolk, England - Between 30 Oct 1217 and 28 Nov 1217) │ │ │ (m. Abt 1180)
│ │ │ │
│ │ │ │ ┌── James de St. Hilary du Harcourt (of Field Dalling, Norfolk, England - Abt 1154) =>
(of Field Dalling, Norfolk, England - Abt 1154) => │ │ │ └── Maud de St. Hilary (of Field Dalling, Norfolk, England -
│ │ │ 24 Dec 1193 bur.Priory of Great Carbrooke, Norfolk, England)
(of Field Dalling, Norfolk, England -│ │ │ 24 Dec 1193 bur.Priory of Great Carbrooke, Norfolk, England)
│ │ │ └── Aveline
│ │ │
│ └── Hawise de Clare ( - Aft 1234)(m. Bef 1215)
( - Aft 1234)(m. Bef 1215) │ │
│ │ ┌── Robert of Gloucester (Abt 1090 - 31 Oct 1147 Bristol, Gloucestershire, England)
(Abt 1090 - 31 Oct 1147 Bristol, Gloucestershire, England) │ │ │ (m. Bef 1122) =>
│ │ ┌── William fitz Robert ( - 23 Nov 1183 bur.Kernsham Abbey, Somerset, England)(m. Abt 1150)
( - 23 Nov 1183 bur.Kernsham Abbey, Somerset, England)(m. Abt 1150) │ │ │ └── Mabel fitz Robert ( - 29 Sep 1157)(m. Bef 1122) =>
( - 29 Sep 1157)(m. Bef 1122) => │ │ │
│ └── Amice of Gloucester ( - 1 Jan 1225)(m. Abt 1180)
( - 1 Jan 1225)(m. Abt 1180) │ │
│ │ ┌── Robert of Meulan (1104 Meulan, Île-de-France, France - 5 Apr 1168 bur.Leicester
│ │ │ Abbey, Leicester, Leicestershire, England)(m. Aft Nov 1120) =>
(1104 Meulan, Île-de-France, France - 5 Apr 1168 bur.Leicester │ │ │ Abbey, Leicester, Leicestershire, England)(m. Aft Nov 1120) =>
│ └── Hawise of Leicester ( - 24 Apr 1197)(m. Abt 1150)
( - 24 Apr 1197)(m. Abt 1150) │ └── Amice de Gael ( - ?? Nuneaton, Warwickshire, England)(m. Aft Nov 1120) =>
( - ?? Nuneaton, Warwickshire, England)(m. Aft Nov 1120) => │
William de Say (20 Nov 1253 of Edmonton, Middlesex, England - Bef 16 Sep 1295)
└── Sibyl