Agnes of Aquitaine, Queen of León and Castile

Agnes of Aquitaine (Spanish: Inés) was a member of the House of Poitou and an Iberian queen in the 11th-century.

Contemporary records show Agnes to have been daughter of William VIII, Duke of Aquitaine and his second wife Matilda, whose origins are uncertain.

She has been confused with a half-sister of the same name who was also an Iberian queen, Agnes, wife of Peter I of Aragon and Navarre.

Sancho was assassinated later that year and Alfonso returned, being crowned king of the reunited kingdom of their father in October 1072.

A burial monument to Agnes is among those in the royal monastery of Sahagún, near that of Alfonso's second wife, Constance of Burgundy.