Analysis of information sources in references of the Wikipedia article "Life peer" in English language version.
Whatever happens, it is to be hoped that the next holder possesses the dukedom as a hereditary peerage. There had been peers for life before workaday life peers were invented in 1958. As recently as 1377, Guichard d'Angle was created Earl of Huntingdon for life by Richard II, and none of those Law Lords between 1876 and 2009 could pass down their peerages.