Isabella's father was the regent for her cousin Afonso V during his minority. In 1441, Pedro arranged the betrothal of Isabella and Afonso V.[3] Their engagement caused a conflict between Peter of Coimbra and Duke Afonso of Braganza, who had wished for the monarch to marry his granddaughter.[5]
In 1448, the king took Afonso of Braganza as his advisor. Isabella's father rebelled and was killed in the Battle of Alfarrobeira in 1449,[6] and her brothers John and James were exiled. Isabella herself did not fall out of favour with the king, however, and she took control of the duchy of Coimbra until her brother John returned to Portugal in 1454.
In 1455, Isabella had her father honoured with a grand ceremony of exoneration at court and had him re-buried in a grand way.[7] Shortly after this, she died at age twenty-three, possibly from poisoning.[8][9] In her will, she left her inheritance to her sister, Philippa of Coimbra.[10]
^Rogers 1961, pp. 68–69. "In 1455 Queen Isabela persuaded her husband, greatly pleased by the birth of his son João, to give her father the burial he merited. The King ignored the opposition from the Duke of Bragança and his son the Count of Ourém (now also Marquis of Valença), and brought the body to the Monastery of the Trinity in Lisbon. It was next moved to the Monastery of St. Eligius (Eloi) and finally transferred to Batalha, where it was interred with great pomp in the Chapel of the Founder."
^Rogers 1961, p. 69. "Queen Isabel, twenty-three years old, soon joined her father in Batalha, for she died at the end of the same year. There were those who insinuated that she had been poisoned by her father's enemies."
Rogers, Francis M. (1961). The Travels of the Infante Dom Pedro of Portugal. Harvard Studies in Romance Languages. Vol. XXVI. Cambridge: Harvard University Press.
* also an infanta of Spain and an archduchess of Austria,** also an imperial princess of Brazil,*** also a princess of Saxe-Coburg and Gotha, Duchess in Saxony,◙ Also a princess of Braganza,ƒ title of pretense
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