Agnes of Beaujeu was a French noblewoman, the daughter of Guichard IV, Sire of Beaujeu and his wife Sybille of Flanders. Agnes was Countess of Champagne by her marriage to Theobald I of Navarre

Theobald I of Navarre

Theobald I , called the Troubadour, the Chansonnier, and the Posthumous, was Count of Champagne from birth and King of Navarre from 1234...

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Family

Agnes' maternal grandparents were Margaret I, Countess of Flanders

Margaret I, Countess of Flanders

Margaret I of Flanders was countess of Flanders from 1191 to her death.-History:She was the daughter of Thierry, Count of Flanders and Sibylla of Anjou, and the heiress of her childless brother, Philip of Flanders.-Family:...

 and Baldwin V, Count of Hainaut

Baldwin V, Count of Hainaut

Baldwin V of Hainaut was count of Hainaut , count of Flanders as Baldwin VIII and margrave of Namur as Baldwin I .-History:...

. Agnes was a niece of Isabelle of Hainaut

Isabelle of Hainaut

Isabella of Hainault was queen consort of France as the first wife of King Philip II of France.- Early life :...

, first wife of Philip II of France

Philip II of France

Philip II Augustus was the King of France from 1180 until his death. A member of the House of Capet, Philip Augustus was born at Gonesse in the Val-d'Oise, the son of Louis VII and his third wife, Adela of Champagne...

, hence Agnes was cousin of Louis IX of France

Louis IX of France

Louis IX , commonly Saint Louis, was King of France from 1226 until his death. He was also styled Louis II, Count of Artois from 1226 to 1237. Born at Poissy, near Paris, he was an eighth-generation descendant of Hugh Capet, and thus a member of the House of Capet, and the son of Louis VIII and...

. Agnes' maternal aunts and uncles included: Baldwin I of Constantinople

Baldwin I of Constantinople

Baldwin I , the first emperor of the Latin Empire of Constantinople, as Baldwin IX Count of Flanders and as Baldwin VI Count of Hainaut, was one of the most prominent leaders of the Fourth Crusade, which resulted in the capture of Constantinople, the conquest of the greater part of the Byzantine...

, Yolanda of Flanders

Yolanda of Flanders

Yolanda of Flanders ruled the Latin Empire in Constantinople for her husband Peter II of Courtenay from 1217 to 1219.She was the daughter of Baldwin V, Count of Hainault, and Countess Margaret I of Flanders. Two of her brothers, Baldwin I and then Henry, were emperors in Constantinople...

, Isabelle, Philip I of Namur

Philip I of Namur

Philip I , called the Noble, was the margrave of Namur from 1195 to his death. He was the second son of Baldwin V, Count of Hainault, and Margaret I, Countess of Flanders...

 and Henry of Flanders

Henry of Flanders

Henry was the second emperor of the Latin Empire of Constantinople. He was a younger son of Baldwin V, Count of Hainaut , and Margaret I of Flanders, sister of Philip of Alsace, count of Flanders....

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Agnes' paternal grandparents were Humbert II of Beaujeu and his wife Agnes of Thiers.

Humbert II's mother was Elisa of Savoy, daughter of Amadeus III, Count of Savoy and his wife Matilda of Albon.

Marriage

Agnes married in 1221 to Theobald I of Navarre

Theobald I of Navarre

Theobald I , called the Troubadour, the Chansonnier, and the Posthumous, was Count of Champagne from birth and King of Navarre from 1234...

. For Theobald, this was his second marriage, after he divorced his first wife, Gertrude of Dagsburg

Gertrude of Dagsburg

Gertrude of Dagsburg was the daughter and heiress of Albert II, count of Metz and Dagsburg . She was a trouvère, and was married three times....

 the same year. Theobald was in need of children, since Gertrude was unable to provide him with any. Agnes and Theobald had a least one daughter:

• Blanche of Navarre (1226–1283) married John I, Duke of Brittany
  John I, Duke of Brittany
  John I the Red , known as John the Red due to the colour of his beard, was Duke of Brittany, from 1237 to his death...
  
  , had issue, including John II, Duke of Brittany
  John II, Duke of Brittany
  John II was Duke of Brittany and Earl of Richmond, from 1286 to his death. He was son of Duke John I and Blanche of Navarre...
  
   and Alix of Brittany.

It is believed that the couple had another daughter:

• Agnes of Navarre

Agnes died 1231. If she had lived for another three years, Agnes would have become Queen consort of Navarre. In need of a son and heir, Theobald married a third and final time to Margaret of Bourbon

Margaret of Bourbon, Queen of Navarre

Margaret of Bourbon was the wife of Theobald I of Navarre, she became Countess of Champagne and Queen of Navarre. Margaret was the daughter of Archambaud VIII of Bourbon and his first wife, Guigone of Forez.- Marriage :...

. Margaret gave Theobald three sons and three daughters, among them were: Theobald II of Navarre

Theobald II of Navarre

Theobald II , called the Young, was Count of Champagne and Brie and King of Navarre from 1253 until his death....

, Beatrice, Duchess of Burgundy

Beatrice of Navarre

Beatrice of Navarre was a daughter of Theobald I of Navarre and his third wife Margaret of Bourbon. Her siblings included, Theobald II of Navarre and Henry I of Navarre. She is also known as Beatrix of Champagne....

 and Henry of Navarre.

Descendants

Agnes' daughter, Blanche married John I, Duke of Brittany

John I, Duke of Brittany

John I the Red , known as John the Red due to the colour of his beard, was Duke of Brittany, from 1237 to his death...

. Blanche was mother to John II, Duke of Brittany

John II, Duke of Brittany

John II was Duke of Brittany and Earl of Richmond, from 1286 to his death. He was son of Duke John I and Blanche of Navarre...

, who married Beatrice of England

Beatrice of England

Beatrice of England , also known as Beatrice de Dreux, was a Princess of England as the daughter of King Henry III of England and Eleanor of Provence...

 and they were parents to: Arthur II, Duke of Brittany

Arthur II, Duke of Brittany

Arthur II , of the House of Dreux, was Duke of Brittany from 1305 to his death. He was the first son of John II and Beatrice, daughter of Henry III of England and Eleanor of Provence....

, Marie, Countess of St-Pol and Blanche, Duchess of Brittany

Blanche of Brittany

Blanche of Brittany was a daughter of John II, Duke of Brittany and his wife Beatrice of England. She is also known as Blanche de Dreux...

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Marie was grandmother of Marie of Valois; she was mother to Joan I of Naples

Joan I of Naples

Joan I , born Joanna of Anjou, was Queen of Naples from 1343 until her death. She was also Countess of Provence and Forcalquier, Queen consort of Majorca and titular Queen of Jerusalem and Sicily 1343–82, and Princess of Achaea 1373/5–81....

. Marie of Valois's sister, Isabella of Valois, Duchess of Bourbon

Isabella of Valois, Duchess of Bourbon

Isabella of Valois, Duchess of Bourbon or Isabella of France , was a French noblewoman, and a daughter of Charles of Valois by his third wife Mahaut of Châtillon. She was the wife of Peter I, Duke of Bourbon...

 was mother of Jeanne, Queen of France

Joanna of Bourbon

Joanna of Bourbon was consort to Charles V of France.Born in Vincennes, Joanna was a daughter of Peter I, Duke of Bourbon and Isabella of Valois, a half-sister of Philip VI of France as the daughter of Charles of Valois and his third wife Mahaut of Châtillon.-Family:Joanna gave birth to nine...

, Blanca, Queen of Castile

Blanca of Bourbon

Blanche of Bourbon was a queen consort of Castile. She was one of the daughters of Peter I, Duke of Bourbon and Isabella of Valois....

, Louis II, Duke of Bourbon

Louis II, Duke of Bourbon

Louis de Bourbon, called the Good , son of Peter de Bourbon and Isabella de Valois, was the third Duke of Bourbon....

 and Bonne, Duchess of Savoy

Bonne of Bourbon

Bonne of Bourbon was a daughter of Peter I, Duke of Bourbon and Isabella of Valois and hence a sister of Joanna of Bourbon.She married Count Amadeus VI of Savoy in 1355 in Paris. They had two children:...

. The third sister was Blanche of Valois

Blanche of Valois

Blanche of Valois was the youngest daughter of Charles of Valois and his third wife Mahaut of Châtillon.-Family:Her paternal grandparents were Philip III of France and Isabella of Aragon. Her maternal grandparents were Guy IV, Count of Saint-Pol and Marie of Brittany.Marie was a daughter of John...

, who was the first wife of Charles IV, Holy Roman Emperor

Charles IV, Holy Roman Emperor

Charles IV , born Wenceslaus , was the second king of Bohemia from the House of Luxembourg, and the first king of Bohemia to also become Holy Roman Emperor....

 and mother of Margaret, Queen of Hungary and Katharine, Electress of Brandenburg

Katharine of Bohemia

Catherine of Bohemia was an Electress of Brandenburg, the second daughter of Emperor Charles IV and Blanche of Valois.-Childhood and family:...

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Ancestry