 The first had been found by Humphrey Wyems, a London lawyer, who may have discovered it in a tailor's shop, and who gave it to Cotton in January 1629.The second was found in Dover Castle in 1630 by Sir Edward Dering.The Dering charter was traditionally thought to be the copy sent in 1215 to the Cinque Ports; but in 2015 the historian David Carpenter argued that it was more probably that sent to Canterbury Cathedral, as its text was identical to a transcription made from the Cathedral's copy of the 1215 charter in the 1290s.