¿Quién se casó con Juana la Beltraneja?

Juana de Castilla, llamada por sus adversarios «la Beltraneja» (Madrid, 28 de febrero de 1462 – Lisboa, 12 de abril de 1530)​ fue una infanta castellana, reina proclamada de Castilla y de León y reina consorte de Portugal. Destituida de su rango, hubo de renunciar por tratado a todos sus títulos y señoríos, incluso a su calidad de infanta castellana y de alteza, quedando llamada oficialmente, por real decreto portugués, «a Excelente Senhora» hasta el final de su larga vida en el exilio de Portugal. Fue la única hija y heredera de Enrique IV y de su segunda esposa, la reina Juana de Portugal, hija de Eduardo I de Portugal.​ Una parte de la nobleza castellana no la aceptó como hija biológica del rey, su padre, a quien acusó de haber obligado a la reina —su mujer— a tener un hijo con su favorito, Beltrán de la Cueva, primer duque de Alburquerque, a pesar de que ambos habían jurado solemnemente que no había sido así. Beltrán no se encontraba en lugar necesario para ello en las fechas concretas. Había sospechas sobre la impotencia de Enrique IV, ya que previamente había estado casado con la infanta Blanca de Navarra y el matrimonio se declaró nulo porque nunca llegó a consumarse. Además, Enrique IV no tuvo más hijos ni con su mujer ni con ninguna de sus amantes.

Afonso V (European Portuguese: [ɐˈfõsu]; 15 January 1432 – 28 August 1481), also known as the African (Portuguese: o Africano), was King of Portugal from 1438 until he died in 1481, with a brief interruption in 1477. The son of Edward, King of Portugal, and Eleanor of Aragon, Afonso acceded to the throne when he was only six years old. His early reign was marked by a struggle over the regency between his mother, Eleanor, and his uncle, Pedro, Duke of Coimbra. Pedro was appointed sole regent in 1439, but the Braganza faction at court continued to challenge his authority. Influenced by his other uncle, Afonso I, Duke of Braganza, the King dismissed Pedro in 1448 and defeated him in the Battle of Alfarrobeira in 1449.

Between 1458 and 1471, Afonso pursued military campaigns in Africa, concentrating efforts predominantly on Morocco. His successful conquests of Alcácer-Ceguer, Arzila, and Tangiers earned him the sobriquet O Africano.

Following the death of Henry IV of Castile in 1474, Afonso claimed the throne of Castile on behalf of his niece, Joanna la Beltraneja. In May 1475, he led an army into Palencia, wed Joanna, and proclaimed himself sovereign of Castile, instigating the War of the Castilian Succession. After the disappointing Battle of Toro and failed attempts at securing support from France, Afonso abdicated the Portuguese throne to embark on a pilgrimage to Jerusalem. He was persuaded to return to Portugal and reassume the crown in November 1477, just days after his heir, John, was declared king.

In the last years of Afonso's reign, the administration of the kingdom was largely directed by John. The Treaty of Alcáçovas, in which Afonso's claim to the throne of Castile was renounced in exchange for Portuguese hegemony in the Atlantic south of the Canary Islands, was signed in 1479. The King died in 1481 and was succeeded by John.