The Counts of Dammartin were the rulers of the county of Dammartin, based in the current commune of Dammartin-en-Goële as early as the 10th century. Located at the central plain of France, the county controlled the roads of Paris to Soissons and Laon. It seems that this county was initially held by Constance, the wife of Manasses Calvus, the first Count. The name Dammartin-en-Goële comes from Domnus Martinus, the Latin name of St. Martin of Tours, who evangelized the region of Goële in the fourth century. A small town in the district of Meaux in the Department of Seine-et-Marne, ancient village of Region of Île-de-France, it appears to go back to the earliest times; Dammartin-en-Goële, also called Velly, was in 1031 one of the most significant places in France.

House of Montdidier 

 Manasses (before 1031 – 1037), son of Hildouin II de Montdidier, seigneur de Ramerupt, married to Constance, daughter of Robert II of France
 Odo (1037–1060), son of the preceding
 Hugues I (1060–1100), brother of the preceding, married to Roharde de Bulles
 Pierre (1100–1105), son of the preceding.

House of Mello 

 Albéric I de Mello (1105–1112), married to Aelis (Adela) de Dammartin, daughter of Hugues I and of Roharde de Bulles.
 Alberic II (1112–1183), son of the preceding, married to Clémence de Bar
 Alberic III (1183–1200), son of the preceding, married in 1164 to Mathilde de Clermont-en-Beauvaisis, daughter of Renaud II, Count of Clermont, and Adelaide, Countess of Vermandois.
 Renaud, (1200–1227), also Count of Boulogne and Aumale, married to Marie de Châtillon
 Ide de Lorraine († 1216), Countess of Boulogne
Mathilde II (1214–1259), Countess of Boulogne, Aumale and Dammartin, daughter of preceding, married to:

 Philippe Hurepel (1218), Count of Clermont-en-Beauvaisis, in 1218
 Afonso III, King of Portugal (1235).
After dispute between the heirs of Matilda, who died without issue, the county of Dammartin was given to Mathieu de Trie, maternal grandson of Aubry III of Dammartin.

House of Trie 

 Mathieu de Trie (1262–1272), son of Jean I, seigneur de Trie and of Mouchy, and of Aélis de Dammartin (daughter of Aubry III)
 Jean II de Trie (1272–1302), Count of Dammartin, killed at Courtrai at the Battle of the Golden Spurs on 11 July 1302, son of preceding. Married to
 Ermengearde
 Yolande de Dreux (v. 1243 † 1313), daughter of John I, Count of Dreux, and of Marie de Bourbon-Dampierre

 Renaud II de Trie (1302–1319), son of preceding and of Yolande de Dreux. Married to Philippe de Beaumont-en-Gâtinais.
 Renaud III de Trie (1319–1327) son of preceding and of Philippe de Beaumont-en-Gâtinais. Died without issue.
 Jean III de Trie (1327–1338), brother of preceding. Married to Jeanne de Sancerre.
 Charles de Trie (1338–1394), son of preceding. Married to Jeanne d'Amboise.
 Blanche de Trie (1394– ). Daughter of preceding. Married to Charles, seigneur de la Rivière, Grand Master of Waters and Forests of France, died without issue.

House of Châtillon 

 Marguerite de Châtillon (died after 1389), daughter of Jacqueline de Trie, sister of Charles de Trie, and Jean de Châtillon, Count of Porcien. Married to Guillaume de Fayel, viscount of Breteuil.

House of Fayel 

 Jean de Fayel (died after 1420), viscount of Breteuil, Count of Dammartin, son of Guillaume de Fayel, viscount of Breteuil, and of Marguerite de Châtillon.
 Marie de Fayel (died before 1439), sister of Jean de Fayel. Married to Renaud de Nanteuil.
 Marguerite de Nanteuil (died 1475), daughter of Marie de Fayel.

The English, who occupied the northern half of France, confiscated the County of Dammartin and gave it to a Burgundian lord, Antoine de Vergy.

House of Vergy 

 Antoine de Vergy († 1439), son of Jean III de Vergy and of Jeanne de Chalon. He is a descendant of the Counts of Dammartin: Jean III of Vergy is son of John II of Vergy, himself son of Henri de Vergy and Mahaut of Trie, daughter of Jean II de Trie, Count of Dammartin.

House of Nanteuil 
Charles VII recovered the county of Dammartin and returned it to the rightful owner.

 Renaud de Nanteuil, husband of Marie de Fayel

 Marguerite de Nanteuil (died 1475), daughter of preceding. Married in 1439 to Antoine de Chabannes

House of Chabannes 

 Antoine de Chabannes (1439–1488)
 Jean de Chabannes (1488–1503), son of the preceding. Married to Suzanne de Bourbon, daughter of Louis de Bourbon, Count of Roussillon, and of Jeanne de Valois
 Antoinette de Chabannes (1503–1527), daughter of the preceding. Married to René of Anjou (1483 † 1521), baron of Mézières, son of Louis of Anjou (illegitimate son of Charles, Count of Maine) and of Louise de la Trémoille.

House of Anjou-Mézières 

 Françoise d'Anjou (1527–1547), daughter of Antoinette de Chabannes. Married to Philippe de Boulainvilliers († 1536), Count of Fauquemberghe

House of Boulainvilliers 

 Philippe de Boulainvilliers (1547–1554), son of Françoise d'Anjou. His mother gave him the county in 1547, which he sold to Anne de Montmorency in 1554.

House of Montmorency 

 Anne de Montmorency (1554–1567), baron then Duke of Montmorency. Married in 1529 to Madeleine de Savoie.
 François de Montmorency (1567–1579), son of the preceding, Duke of Montmorency. Married in 1557 to Diane de France, without issue.
 Henri I de Montmorency (1579–1614), brother of the preceding, Duke of Montmorency. Married :
 in 1558 to Antoinette de La Marck (1542 † 1591)
 in 1593 to Louise de Budos (1575 † 1598)

 Henri II de Montmorency (1614–1632), son of the preceding, Duke of Montmorency.

The king confiscated his property and gave Dammartin to the Prince of Condé. The county then lost its importance, and the castle was dismantled.

House of Bourbon-Condé 

 Henri II de Bourbon (1632–1646 ), prince of Condé. Married to Charlotte de Montmorency (1594 † 1650), sister of Henri II de Montmorency

The county is transmitted through his descendants until the Revolution.

Sources 

Mathieu, J. N., Recherches sur les premiers Comtes de Dammartin, Mémoires publiés par la Fédération des sociétés historiques et archéologiques de Paris et de l'Ile-de-France, 1996
 
Dammartin
French noble families