His wife and mother-in-law (Grissim) were descendants of Owen Tudor, second husband of Catherine of Valois, Dowager Queen of England.
Mary attended Isabella's daughter-in-law Catherine of France, while she herself was attended upon by ten people.
A previously thought lost Theatre 625 production from 1966 of Sisson's stage play The Queen and the Welshman (1958), concerning the affair of Henry V's widow Catherine with Sir Owen Tudor, was found in 2010 to have been deposited with the Library of Congress.
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James was the son of Francesco del Balzo, 1st Duke of Andria by Margaret of Taranto (c.1325–1380), daughter of Prince Philip I of Taranto and his second wife, Catherine of Valois.
Good news reached him from England that on 6 December, Queen Catherine had borne him a son and heir at Windsor.