None of the charters are original, and Stevenson dismissed all of them as fraudulent apart from the Kentish one of 855. Stevenson saw the decimation as a donation of royal demesne to churches and laymen, with those grants which were made to laymen being on the understanding that there would be reversion to a religious institution. Up to the 1990s, his view on the authenticity of the charters was generally accepted by scholars, with the exception of the historian H. P. R. Finberg, who argued in 1964 that most are based on authentic diplomas. Finberg coined the terms the 'First Decimation' of 844, which he saw as the removal of public dues on a tenth of all bookland, and the 'Second Decimation' of 854, the donation of a tenth of "the private domain of the royal house" to the churches. He considered it unlikely that the First Decimation had been carried into effect, probably due to the threat from the Vikings. Finberg's terminology has been adopted, but his defence of the First Decimation generally rejected. In 1994, Keynes defended the Wilton charters in group 2, and his arguments have been widely accepted.