This threw further doubt on the case, but later historians correctly identified her. George Buck, who found the only surviving copy of "Titulus Regius", was the first to identify Eleanor Talbot as the woman in question. Buck, a defender of Richard, accepted the validity of the precontract. His view has been followed by many defenders of Richard since, including Horace Walpole and Clements Markham. Later Ricardians have also either accepted it as fact, or argued that Richard sincerely believed it to be true. It is also commonly argued by Ricardians that Stillington was imprisoned by Edward IV in 1478 because he incautiously spoke of the precontract to George, Duke of Clarence.