In 934 Arnulf "Great" I Count Flanders (age 44) and Adela Vermandois Countess Flanders (age 24) were married. She by marriage Countess Flanders. The difference in their ages was 20 years. She the daughter of Herbert Vermandois II Count Vermandois II Count Soissons II Count Meaux and Adela Capet Countess Vermandois, Soissons and Meaux. He the son of Baldwin "Bald" II Margrave Flanders and Aelfthryth Wessex Margrave Flanders.

Before 30 Mar 987 Arnulf II Count Flanders (age 27) and Rozala of Italy (age 37) were married. She by marriage Countess Flanders. He the son of Baldwin III Count Flanders and Matilda Billung Countess Flanders (age 47).

In 1012 Baldwin "Bearded" IV Count Flanders (age 32) and Ogive Luxemburg Countess Flanders were married. She by marriage Countess Flanders. He the son of Arnulf II Count Flanders and Rozala of Italy.

Before 1055 Baldwin VI Count Flanders I Count Hainault (age 25) and Richilde Countess Flanders and Hainault were married. She by marriage Countess Flanders, Countess Hainault. He the son of Baldwin "The Good" V Count Flanders (age 42) and Adela Capet Duchess Normandy (age 45).

After 1132 Thierry Metz Count Flanders (age 33) and Sibylla Anjou Countess Essex and Flanders (age 20) were married. She by marriage Countess Flanders. She the daughter of Fulk "Young" King Jerusalem (age 43) and Ermengarde La Flèche De Baugency Countess Anjou. He the son of Theodoric "Valiant" Metz II Duke Lorraine and Gertrude Flanders Duchess Lorraine.

In 1223 William Dampierre II Count Flanders (age 27) and Margaret II Countess Flanders (age 20) were married. He by marriage II Count Flanders. She the daughter of Baldwin IX Count Flanders VI Count Hainault and Marie Blois Countess Flanders. She a great x 3 granddaughter of King William "Conqueror" I of England.

In Jun 1246 Guy Dampierre Count Flanders (age 20) and Mathilde Bethune were married. He by marriage Count Flanders. He the son of William Dampierre II Count Flanders and Margaret II Countess Flanders (age 43). He a great x 4 grandson of King William "Conqueror" I of England.

In 1265 Robert Dampierre III Count Flanders (age 16) and Blanche Capet Countess Flanders (age 15) were married. She by marriage Countess Flanders. He the son of Guy Dampierre Count Flanders (age 39) and Mathilde Bethune. They were third cousins. He a great x 5 grandson of King William "Conqueror" I of England. She a great x 2 granddaughter of King Henry "Curtmantle" II of England.

In Mar 1265 Guy Dampierre Count Flanders (age 39) and Isabelle Luxemburg Countess Flanders (age 18) were married. She by marriage Countess Flanders. The difference in their ages was 21 years. She the daughter of Henry "Great" Luxemburg V Count Luxemburg III Count Namur (age 49) and Margaret of Bar Countess Luxemburg and Namur (age 45). He the son of William Dampierre II Count Flanders and Margaret II Countess Flanders (age 62). They were third cousin once removed. He a great x 4 grandson of King William "Conqueror" I of England. She a great x 5 granddaughter of King William "Conqueror" I of England.

In 1320 Louis Dampierre II Count Nevers I Count Flanders (age 16) and Margaret Capet Countess Nevers amd Flanders (age 11) were married. She by marriage Countess Nevers, Countess Flanders. She the daughter of Philip V King France I King Navarre (age 27) and Joan of Burgundy Queen Consort France (age 28). He the son of Louis Dampierre I Count Nevers (age 48) and Joan Rethel Countess Nevers and Rethel. They were fourth cousins. She a great x 5 granddaughter of King Henry "Curtmantle" II of England.

In or before 1348 Louis Dampierre III Count Nevers II Count Flanders (age 17) and Margaret Brabant Countess Nevers and Flanders (age 24) were married. She by marriage Countess Nevers, Countess Flanders. She the daughter of John Brabant III Duke Brabant (age 47) and Marie Évreux Duchess of Brabant. He the son of Louis Dampierre II Count Nevers I Count Flanders and Margaret Capet Countess Nevers amd Flanders (age 38). They were half second cousin once removed. She a great granddaughter of King Edward "Longshanks" I of England.

Robert Dampierre III Count Flanders and Yolande Burgundy II Countess Nevers and Flanders were married. She by marriage Countess Flanders. He the son of Guy Dampierre Count Flanders and Mathilde Bethune. They were second cousin once removed. He a great x 5 grandson of King William "Conqueror" I of England.

Baldwin VII Count Flanders and Hawise Canhiart Countess Flanders were married. She by marriage Countess Flanders. She the daughter of Alan Canhiart IV Duke Brittany and Ermengarde Anjou Duchess Brittany and Aquitaine. He the son of Robert II Count Flanders and Clementia Ivrea Countess Louvain and Flanders. They were fourth cousins.

Baldwin IX Count Flanders VI Count Hainault and Marie Blois Countess Flanders were married. She by marriage Countess Flanders, Countess Flanders. She the daughter of Henry Blois I Count Champagne and Marie Capet Countess Champagne. He the son of Baldwin Flanders V Count Hainault and Margaret Metz Countess Hainault and Flanders. They were half third cousin once removed. She a great x 2 granddaughter of King William "Conqueror" I of England.

Baldwin "Bearded" IV Count Flanders and Matilda Normandy Countess Flanders were married. She by marriage Countess Flanders. The difference in their ages was 33 years. She the daughter of Richard "Good" Normandy II Duke Normandy and Judith Penthièvre Duchess Normandy. He the son of Arnulf II Count Flanders and Rozala of Italy. They were third cousin once removed.

Baldwin III Count Flanders and Matilda Billung Countess Flanders were married. She by marriage Countess Flanders. She the daughter of Hermmann Billung Margrave Billung March and Hildegard Westerburg Margrave Billung March. He the son of Arnulf "Great" I Count Flanders and Adela Vermandois Countess Flanders.

William Dampierre III Count Flanders and Beatrix Reginar Countess Flanders were married. She by marriage Countess Flanders. She the daughter of Henry Reginar II Duke Brabant and Marie Swabia Duchess Brabant. He the son of William Dampierre II Count Flanders and Margaret II Countess Flanders. They were third cousins. He a great x 4 grandson of King William "Conqueror" I of England. She a great x 4 granddaughter of King William "Conqueror" I of England.