Dammartin of Seine-et-Marne, France
Manasses de Montdidier [a], Count of Dammartin, b abt 1006, d 15 Dec 1037. He md Constance of France abt 1028, daughter of Robert II, King of France, and Constance of Provence.
Child of Manasses de Montdidier and Constance of France was:

Hugh I de Montdidier, Count of Dammartin, b abt 1035, d abt 1100. He md Rohese de Clare abt 1072, daughter of Sir Richard Fitz Gilbert, Lord of Clare and Tonbridge, and Rohese Giffard.
Child of Hugh I de Montdidier and Rohese de Clare was:

Eudes de Dammartin b abt 1076, of Norton and Mendlesham, Suffolk, England, d 1130. He md Basilie abt 1098. She was b abt 1085.
Child of Eudes de Dammartin and Basilie was:

Alberic I de Dammartin, Count of Dammartin, Lord of Norton, b abt 1110, of Dammartin, Seine-et-Marne, France, and Norton, Suffolk, England, d 1181/82. He md [1] Mathilde abt 1133, and [2] Joan Basset [b] abt 1160. Mathilde was b abt 1118, d aft 1147.
Child of Alberic I de Dammartin and Mathilde was:

Alberic II de Dammartin, Count of Dammartin, b abt 1140, of Dammartin, Seine-et-Marne, France, d 19 Sep 1200, London, England. He md Maud/Matilda of Clermont abt 1164, daughter of Renaud II of Clermont, Count of Clermont, and Clemence of Bar.
Children of Alberic de Dammartin and Matilda of Clermont were:
  • Juliane de Dammartin b abt 1174, Dammartin, Seine-et-Marne, France. She md Hugh V de Gournay, Seigneur of Gournai, abt 1190, son of Hugh IV de Gournay and Melisende de Marle de Coucy.
  • Simon de Dammartin b abt 1175.
  • Agnes de Dammartin b abt 1178, Dammartin, Seine-et-Marne, France. She md William I de Fiennes, Lord of Fiennes, abt 1196, son of Enguerrand/Ingelram de Fiennes and Sibyl de Boulogne (de Tingry).

Simon de Dammartin, Count of Aumale, b abt 1175, Dammartin, Seine-et-Marne, France, d 21 Sep 1239, Abbeville, France. He md Marie of Ponthieu 1208, daughter of William III of Ponthieu, Count of Ponthieu, and Alice/Alix of France.
Child of Simon de Dammartin and Marie of Ponthieu was:

Joan de Dammartin b abt 1216, Dammartin, Seine-et-Marne, France, d 15 Mar 1278/79, Abbeville, France. She md Fernando III, King of Castile, 1237, Burgos, Castile, Spain, son of Alfonso IX, King of Leon, and Berengaria of Castile.

NOTES:
a. It is believed that Manasses received the countship of Dammartin upon his marriage to Constance, daughter of Robert II, King of France.

b. While several standard sources state that Joan Basset was the mother of Alberic II, giving a rough marriage date of Alberic I and Joan as "ca 1160", even if this date is not accurate, it is patently clear that Joan could not have been Alberic II's mother. Joan Basset is known to have married twice before her marriage to Alberic I, with her second marriage occuring "ca 1152". This, combined with all other known chronology for Alberic II and his antecedents, has resulted in a change in thought among the professional genealogical community. It is now accepted that Alberic II was the son of his father's first wife.
SOURCES:
AR: Line 109[29-30], Line 144[26-27], Line 152[26-27,27]; SGM: Todd Farmerie, Peter Stewart, Chris Phillips [ref: Keats Rohan; Recherches sur les premiers comtes de Dammartin, Memoires publies par la Federation des societes historiques et archeologiques de Paris et de l'Ile-de-France, 47 (1996), by J. N. Mathieu.
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