Agnes de Dammartin 
Agnes de was born in 1177 in Dammartin, Seine-et-Marne, Ile-de-France, France. Agnes de's father was Alberic II Comte de Dammartin and her mother was Maud (Mathilde) of Clermont. She had a brother and a sister, named Simon II de and Juliana de. She was the youngest of the three children.
Agnes de and William I de were married in a religious ceremony about 1203 in Martock, Somerset, England. They had two sons and a daughter, named Enguerrand de, William de and Mahaut de.
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Children
Enguerrand de Fiennes , Seigneur de Fienes
Enguerrand de was born in 1210 in Tolleshunt, Essex, England. He died at the age of 55 in 1265 in Wendover Manor, Buckinghamshire, England.
William de la Plaunche , of Wendover
William de was born about 1215 in Wendover Manor, Buckinghamshire, England.
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