 Although he married Beatrice, an illegitimate daughter of King John I of Portugal and Inez Perez Esteves, he died childless on 13 October 1415.The Earldom and castle of Arundel passed to a cousin John Fitzalan, 13th Earl of Arundel, the remainder of his inheritance was divided among Joan and her two surviving sisters, Elizabeth and Margaret.On 23 July 1392, Joan was married to William de Beauchamp, 1st Baron Bergavenny (c.1344 - 8 May 1411) the son of Thomas de Beauchamp, 11th Earl of Warwick and Katherine Mortimer.