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In page Eleanor of Naples, Duchess of Ferrara:

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Not much is known of Eleanor's childhood or early life growing up as the first princess of Naples but she was betrothed to Sforza Maria Sforza, Duke of Bari, son of Francesco Sforza I and Bianca Maria Visconti, at the age of five. In 1465 she was married by proxy to Sforza Maria but because of his father's death and his brother Galeazzo's succession and subsequent refusal to honour the marriage settlements, the marriage was never consummated. Her father, after trying to break the marriage contract so that Eleanor could marry someone else, only succeeded in doing so after reaching an agreement where Eleanor's niece Isabella of Aragorn would marry Galeazzo's son and heir.[citation needed]