Henry IV of Castile child Joanna la Beltraneja
Joan of Portugal
The remoteness of Aragon led to an approach to Portugal. In March 1453, before his divorce from Blanche was finalised, there was no record of negotiations for the new marriage between Henry and Joan of Portugal, sister of the king Afonso V of Portugal. The first marital approaches were made in December of that year, although the negotiations were long and the proposal wasn't definitively agreed until February 1455.: 59  According to chroniclers of the time, Joan did not provide a dowry and would not have to return anything even if the marriage turned out to be a failure. The length of the negotiations and the concessions could be interpreted as caused by the concerns about the rumours of Henry's impotence.: 65–67  The wedding was celebrated in May 1455, but without an affidavit of official bull authorizing the wedding between them, although they were first cousins (their mothers were sisters) and half second cousins (their paternal grandmothers were half-sisters). On 28 February 1462, the queen gave birth to a daughter Joanna la Beltraneja, whose paternity came into question during the conflict for succession to the Castillian throne when Henry died.
Henry IV was twenty-six years old when his half-sister Isabella was born. She was the daughter of his father's second marriage in 1447, to Isabella of Portugal. Henry made a number of attempts throughout his reign to arrange a politically advantageous marriage for his much younger sister. The first attempt was when the six-year-old Isabella was betrothed to Ferdinand, son of John II of Navarre (a cadet branch of the House of Trastámara).: 35  This arrangement, however, did not last long.
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