and Eleanor of England. In 1170 Eleanor married King
Alfonso VIII of Castile in Burgos at the age of 9. Her parents' purpose in arranging the marriage was to secure Aquitaine's Pyrenean border, while Alfonso sought an ally in his struggles with
Sancho VI of Navarre. In 1177, this led to Henry overseeing arbitration of the border dispute. Around 1200, Alfonso began to claim that the duchy of
Gascony was part of Eleanor's dowry, but there is no documented foundation for that claim. It is highly unlikely that Henry II would have parted with so significant a portion of his domains. At most, Gascony may have been pledged as security for the full payment of his daughter's dowry. Her husband went so far on this claim as to invade Gascony in her name in 1205. In 1206, her brother
John granted her safe passage to visit him, perhaps to try opening peace negotiations. In 1208, Alfonso yielded on the claim. Decades later, their great-grandson
Alfonso X of Castile would claim the duchy on the grounds that her dowry had never been fully paid. Of all Eleanor of Aquitaine's daughters, her namesake was the only one who was enabled, by political circumstances, to wield the kind of influence her mother had exercised. In her marriage treaty, and in the first marriage treaty for her daughter
Berengaria, Eleanor was given direct control of many lands, towns, and castles throughout the kingdom, including major towns like
Aguilar de Campóo,
Logroño, and
Calahorra. She was almost as powerful as Alfonso, who specified in his will in 1204 that she was to rule alongside their son in the event of his death, including taking responsibility for paying his debts and executing his will. It was she who persuaded him to marry their daughter Berengaria to
Alfonso IX of León.
Troubadours and sages were regularly present in Alfonso VIII's court due to Eleanor's patronage. The Catalan poet,
Ramon Vidal de Besalu, wrote about Eleanor and described her as wrapped in a red silk mantle with
Angevin lions, and
Guillem de Bergued addressed a poem to her. Eleanor took a particular interest in supporting religious institutions. In 1179, she took responsibility to support and maintain the shrine to
St. Thomas Becket in the
cathedral of Toledo, which had been founded by Count
Nuño Peréz de Lara and his wife
Teresa Fernández in 1177. She made gifts to the abbeys of
Grandmont and
Fontevraud. She also created and supported the
Abbey of Santa María la Real de Las Huelgas, outside the city of
Burgos, and its affiliated hospital for pilgrims, the Hospital del Rey. It served as a refuge and tomb for her family for generations, and her daughter Constance took the veil there and became known as the Lady of Las Huelgas. ==Regent==