Beatrice (Portuguese: Beatriz, pronounced [bi.ɐˈtɾiʃ]; 7–13 February 1373 – c. 1420) was the only surviving legitimate child of King Ferdinand I of Portugal and his wife, Leonor Teles. She became Queen consort of Castile by marriage to King John I of Castile. Following her father's death without a legitimate male heir, she claimed the Portuguese throne but lost her claim to her uncle, who became King John I of Portugal, founder of the House of Aviz.
During her early years, Beatrice was a pawn in the changing politics of foreign alliances of her father, who negotiated successive marriages for her. She would eventually marry King John I of Castile, by whom Beatrice became Queen Consort of Castile. At the death of her father, Beatrice was proclaimed Queen regnant of Portugal and her mother assumed the regency in her name.
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