The third daughter of Peter the Cruel of Castile and his long-term mistress (and sometime wife) Maria of Padilla, Isabella of Castile‘s childhood was marred by her father’s battles to hold on to his throne and almost constant warfare with Aragon.
Peter received support from Edward III’s son the Black Prince, but his failure to pay the costs of the campaign, his faithlessness, and the failing health of the black Prince, meant he was left to his own devices by 1367. Peter’s own nobles backed his illegitimate brother, Henry of Tastamara, who eventually defeated and killed Peter in March 1369.
Isabella’s mother had died in 1361 and her 3-year-old brother, Alfonso, in 1362. On Peter’s death, Isabella’s older sister, Constance, inherited her father’s claim to the crown of Castile and, taking Isabella with her, took refuge in the English territory of Guyenne. Constance married John of Gaunt (third son…
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