John Fitz Alan, 6th? Earl of Arundel, (if by tenure), though never so referred to either by contemporaries or posterity; on the other hand he is called Lord (ie. feudal possessor) of Arundel Castle by late Nove 1243; fought on Henry III's side at Battle of Lewes 1264, where captured by Simon de Montfort's forces; married Maud, daughter of Theobald le Botiller, and died by 10 Nov 1267. [Burke's Peerage]
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John Fitz-Alan, in the 28th Henry III [1244], upon the division made of the property of Hugh Albini, Earl of Arundel, then made, had the castle of Arundel assigned to him for his principal seat, thus becoming 5th Earl of Arundel; and soon after that, in consideration of £1,000 fine, had livery of his own castles of Clun, Blancminster and Schrawurthen. In the 42nd Henry III [1258], his lordship was made captain-general of all the forces designed for guarding the Welsh marches, and in the baronial war, he appears first to have sided with the barons, and afterwards with the king. He d. 1267, having m. Maud, dau. of Roesia de Verdun (which lady m. 2ndly Richard de Amundevill), by whom he had a son and successor, John Fitz-Alan. [Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, Ltd, London, 1883, p. 200, Fitz-Alan, Earls of Arundel]