Aliénor d'Aquitaine, aussi connue sous le nom de Éléonore d'Aquitaine ou de Guyenne, née vers 1122 ou 11241,2 et morte le 31 mars ou le 1er avril 12043 à Poitiers4, et non à l'abbaye de Fontevraud5,6, a été tour à tour reine de France, puis reine d'Angleterre.
Duchesse d'Aquitaine et comtesse de Poitiers, elle occupe une place centrale dans les relations entre les royaumes de France et d'Angleterre au xiie siècle : elle épouse successivement le roi de France Louis VII (1137), puis Henri Plantagenêt (1152), futur roi d'Angleterre Henri II, renversant ainsi le rapport des forces en apportant ses terres à l'un puis à l'autre des deux souverains. À la cour fastueuse qu'elle tient en Aquitaine, elle favorise l'expression poétique des troubadours en langue d'oc. À compter de son premier mariage (pendant lequel elle a participé à la deuxième croisade), elle joue un rôle politique important dans l'Europe médiévale.
Eleanor of Aquitaine (French: Aliénor d'Aquitaine, Éléonore, Latin: Alienora; 1122 or 1124 – 1 April 1204) was queen consort of France (1137–1152) and England (1154–1189) and duchess of Aquitaine in her own right (1137–1204). As a member of the Ramnulfids (House of Poitiers) rulers in southwestern France, she was one of the wealthiest and most powerful women in western Europe during the High Middle Ages. She was patron of literary figures such as Wace, Benoît de Sainte-Maure, and Bernart de Ventadorn. She led armies several times in her life and was a leader of the Second Crusade.
As duchess of Aquitaine, Eleanor was the most eligible bride in Europe. Three months after becoming duchess upon the death of her father, William X, she married King Louis VII of France, son of her guardian, King Louis VI. As queen of France, she participated in the unsuccessful Second Crusade. Soon afterwards, Eleanor sought an annulment of her marriage, but her request was rejected by Pope Eugene III. However, after the birth of her second daughter Alix, Louis agreed to an annulment, as 15 years of marriage had not produced a son. The marriage was annulled on 21 March 1152 on the grounds of consanguinity within the fourth degree. Their daughters were declared legitimate, custody was awarded to Louis, and Eleanor's lands were restored to her.
As soon as the annulment was granted, Eleanor became engaged to the duke of Normandy, who became King Henry II of England in 1154. Henry was her third cousin and 11 years younger. The couple married on Whitsun, 18 May 1152, eight weeks after the annulment of Eleanor's first marriage, in Poitiers Cathedral. Over the next 13 years, she bore eight children: five sons, three of whom became kings; and three daughters. However, Henry and Eleanor eventually became estranged. Henry imprisoned her in 1173 for supporting their son Henry's revolt against him. She was not released until 6 July 1189, when Henry died and their second son, Richard the Lionheart, ascended the throne.
As queen dowager, Eleanor acted as regent while Richard went on the Third Crusade; on his return, Richard was captured and held prisoner. Eleanor lived well into the reign of her youngest son, John.