Beatrice of Castile was a Spanish noblewoman born in 1180, known for her role as the daughter of Alfonso VIII of Castile and Eleanor of England. She married Count Manuel of Portugal, which helped strengthen ties between the kingdoms of Castile and Portugal. Beatrice's marriage was part of a broader strategy to secure alliances during a time of political instability in the region. Beatrice had several children, including Sancho II of Portugal, who became king. Her lineage played a significant role in the history of both Castile and Portugal, influencing the political landscape of the Iberian Peninsula during the Middle Ages.