Nielsen Hayden genealogy
Ancestors of William Marmion
Abt 1229 - Abt 1266 (~ 37 years)
┌── Roger Marmion 
(Between 1060 and 1070 Normandy, France - Bef 29 Sep 1129) =>
(Between 1060 and 1070 Normandy, France - Bef 29 Sep 1129) => ┌── Robert Marmion (Between 1090 and 1095 Normandy, France -
│ Between 1143 and 1144 Coventry, Warwickshire, England)
(Between 1090 and 1095 Normandy, France -│ Between 1143 and 1144 Coventry, Warwickshire, England)
│ └── (Unknown) de Abetot =>
=> │
┌── Robert Marmion (Bef 1133 - Abt Oct 1181)
(Bef 1133 - Abt Oct 1181) │ │
│ │ ┌── Gervase de Réthel, Archdeacon of Reims ( - 1124) =>
( - 1124) => │ └── Milicent of Réthel (Between 1105 and 1115 - ??)
(Between 1105 and 1115 - ??) │ └── Elizabeth of Namur ( - Aft 1141) =>
( - Aft 1141) => │
┌── William Marmion (Between 1155 and 1160 Tamsworth, Warwickshire, England - Bef 1221)
(Between 1155 and 1160 Tamsworth, Warwickshire, England - Bef 1221) │ └── Elizabeth
│
┌── Geoffrey Marmion (Abt 1198 - Between Oct 1246 and 1255)
(Abt 1198 - Between Oct 1246 and 1255) William Marmion (Abt 1229 Checkingden, Oxfordshire, England - Abt 1266)
└── Rosamund ( - Between 25 Apr 1273 and 2 Feb 1274)
( - Between 25 Apr 1273 and 2 Feb 1274)