In these twelve manuscripts, De Quincey attempted to define and illustrate the concept of mythus. As introduced in the note attached to his essay on ‘Evil’ (MS Dove Cottage, Unnumbered 3r), a mythus is a ‘tradition of the people’, a narrative of ‘the reasonable origin of things’. When ‘traditl anecdotes’ are ‘wed’ to history, the result is not a ‘Fable’ (MS Berg 216916 verso), but an historicised account of cultural beliefs.