[1] er only surviving brother was Thomas Fitzalan, 12th Earl of Arundel, a major figure during the reign of Henry IV, and of whom Joan was his co-heiress.
[citation needed] On 21 September 1397, Joan's father, the Earl of Arundel, who was also one of the Lords Appellant, was beheaded on Tower Hill, London, on charges of high treason against King Richard II of England.
[3] In October 1400, the new king Henry IV who had ascended the throne following Richard's deposition in 1399, restored the titles and estates to Thomas Fitzalan, Joan's brother.
Although he married Beatrice, an illegitimate daughter of King John I of Portugal and Inez Perez Esteves, he died childless on 13 October 1415.
[citation needed] The marriage produced a son and a daughter: Joan, Baroness Bergavenny, died on 14 November 1435, at the age of 60.