William de Ros, of Hamlake, upon giving security for the payment of £100 for his relief, had livery of his lands. This feudal lord, in the lifetime of his father, was an active supporter of the baronial cause and was made prisoner at the battle of Lincoln (1st Henry III) [1216] by the royalists but soon after released and delivered up to his father upon bail. He was subsequently engaged in the wars of Gascony and he had two military summonses in the 42nd Henry III [1258] to march against the Scots and Welsh. By the deaths of his two great aunts, the sisters of his grandmother, Rose Trusbut, s. p., he became sole heir of the baronial estate of Trusbut and Watre. He m. Lucia, dau. of Reginald Fitz-Piers, of Blewleveny, in Wales, and d. in 1258. He was s. by his son, Robert de Ros. [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage Ltd, London, England, 1883, p. 458, Ros, or Roos, Baron Ros]