Leonor of Castile was a Spanish queen born in 1241, known for her marriage to King Edward I of England. She was the daughter of Ferdinand III of Castile and Joanna of Ponthieu. Leonor played a significant role in the political landscape of her time, particularly in strengthening ties between England and Spain. As queen consort, Leonor was influential in various diplomatic matters and supported her husband's military campaigns. She was also a patron of the arts and education, contributing to the cultural development of her era. Leonor passed away in 1290, leaving a lasting legacy in both England and Spain.