William de Belward was married to Beatrix, daughter of Hugh Kiviliock, the fifth earl of Chester, and coheir to her brother Randal, Earl of Chester. He was, in right of his mother, Baron of Malpas, although it is said by some that he had only half the barony; but it is agreed by Sir William Dugdale, and other of our antiquaries, that he left issue three sons; David, Robert, hereafter mentioned, and Richard.
Source: Collins's Peerage of England by Sir Egerton Brydges, K.J., London (1812) , Volume IV.