William Qualtrough of Kentraugh, who gave evidence against Illiam Dhone and afterwards rose to be Attorney-General.

He was one of the four men exempted from the general pardon along with William Christian after the rising of 1651. Unlike Christian he submitted to the lord's mercy, and he was pardoned on 4 February 1663 on condition of bonds and good behaviour.

Before that pardon he had deposed against Christian. His deposition was taken at Castle Rushen on 26 November 1662, the last of the seven printed in the Manx Society's edition of the trial, and A. W. Moore thought it was probably taken merely to increase the amount of evidence. Qualtrough said that her Ladyship and the country had been agreed, and that Receiver Christian was looked upon to be their head or chief in the rising at Ronaldsway. The same day the Court of General Gaol Delivery sat, Christian refused to come to abide the law, and the Deputy-Governor demanded the law of the Deemsters.

He was on the bench and then in office within a decade. He was made Deemster and reinvested in his estate by the eighth Earl of Derby's own order. By 1672 he was Attorney-General, and he appears in that character in an account of a court held in the interval after Lord Charles's death, when the commissions of all the officers had determined and utterly ceased and their authority with them: Henry Nowell as Deputy-Governor, Richard Stevenson the late Receiver-General as assistant to the courts, Thomas Norris and Edward Christian as Deemsters, Richard Tyldesley as Comptroller and Clerk of the Rolls, and Qualtrough as Attorney-General.