Princess Eleonora of Portugal was a member of the Portuguese royal family, born in the late 15th century. She was the daughter of King John II of Portugal and Queen Leonor of Portugal. Eleonora played a significant role in the political landscape of her time, particularly through her marriage alliances. In 1497, she married Frederick I of Denmark, which strengthened ties between Portugal and Denmark. This union was part of a broader strategy to enhance diplomatic relations in Europe. Eleonora's life reflects the importance of royal marriages in forging alliances during the Renaissance period.